This time a somewhat bigger Mapster update:
1.    some 330 sheets of the Russian 1:84,000 map (2-verst), of which approx. 200 come from the University of Warsaw, and some 120 from the Library of Congress. Most maps are dated 1914 -  1917, while several dozens are later, 1920s reprints, some with stamps of the original "Archiwum Map W.I.G." A few more sheets might become available in the autumn, but next large update can be expected no earlier than mid-next year.
2.    Around 20 sheets of Russian and Soviet 1:42,000 map (1-verst), mainly from north-western Belarus. Some sheets are incomplete, they will be re-scanned and updated in the autumn. In a few days, a couple of extra, joint sheets (x4) of a WW1 edition of this map will become available.
3.   Through kind support from Mr Jean-Luc Arnauda of CNRS, we have received permission from Université Paris 8 to add to Mapster approx. 290 sheets of the German 1:300,000 Osteuropa map (300 dpi). They are, very well scanned and hard to get, first editions from 1942/1943 and provide coverage well east of Moscow, reaching, in the south-east, to Kazakhstan. We have also added, courtesy of our Czech friends, some 50 other sheets of this map type, mainly Central Europe (400 dpi). They include some very interesting military-geographical (Mil-Geo) editions with overprints and extended description on the front and back of each sheet. Three maps show the area of Pripet river (Pripetgebiet), a few others come from a large set on the accessibility of the Carpathian Mountains (Durchgängigkeit Karpaten), and a single sheet is T50 Tarnopol, with extra information and town plans of Czortkow and Tarnopol on the reverse. Some of the 1:300,000 sheets are very late editions (January - April 1945), e.g. Breslau, Berlin, and one irregular sheet of a „Strassenkarte” marked as Geheim (Secret) dated for 30th April 1945. It shows the area south-west of the Czech town Ústí nad Labem). All sheets available via Mapster index (please note - VERY LARGE index sheet - takes a long time to load!)
4.    Some 45 sheets of the German 1:500,000, WW2 edition, mainly USSR, Central and South-Central Europe, 400 dpi.

We have failed to note an important event: on 13th June this year, Col Robert Bauer defended his PhD thesis on the "Transformation method for points in a non-uniform triangulation network into the uniform coordination system" (in Polish), which allows accurate callibration of maps, including those by WIG, for navigational (gps) purposes. Congratulations!

Mapster:
Because we’re rather busy at work, we’ve had to re-schedule map updates. This time, we have added about 40 sheets to the German, WW1, 1:100,000 map of western Russia (Karte des westlichen Russlands): H18, K28, K37, L25, O14, O16 - O18, O35, P17, P19, P31, P32, P35 - P38, Q11, Q14 - Q16, Q36 - Q38, R36, R37, R40, S36, S38, S41, T35 - T37, T39 - T41, U35 - U38, U40 i U41.
Some of them are different editions, e.g. 1914 and 1915, although no apparent updates are visible. Most of them are courtesy of the University of Berkeley library, and the Library of Congress, due to the efforts of our collegues from www.easteurotopo.org, for which we are very grateful indeed. Other sheets have been provided by private collectors.

Additionally, three German 1:100,000 (Grossblatt) sheets have been added: No 37, 67 and 317.

Because there seems to be no end to new scans, we have decided on a (relatively low-scale)  reshuffle of some maps available via sub-pages. For this reason, some files, such as German maps, will not be available for the next several days, although they might be already accessible via pull-down manu on Mapster. Please bear with us, what comes out should be a little bit more organized than what came in!
In the meantime, we have also added 34 new sheets of a German 1:800 000 map (this type, was replaced in mid-1920s, by the 1:500,000 and 1: 1 mln scale maps), plus 13 new scans of  German 1:25,000 photomaps (Bildplan). This means the source of those maps at the Poznan university is almost dry (a couple of scans will be added soon). Other sheets, approx 1,500 + will need to be acquired from other sources, which is difficult. We do not expect to have any more sheets of this map type by the end of this year.

18 sheets of WIG 1:100,000 maps have been added. They include older variants, from 1920s, from the area of Kresy, and newer editions. from 1930. All sheets available in 300 dpi and 600 dpi. New maps have been marked with a green "New" bubble on the lists.
We have also added approx. 30 scans (600 dpi), to the collection of German air photo maps (Bildplan edition) courtesy of archiwum Wydziału Geologii i Geografii UAM in Poznan, Poland. Majority of those sheets have already been made available in 400 dpi, but this wasn't good enough, so all will have been re-scanned at 600 dpi. We expect around 170 – 180 sheets (in total) from the same source, but please bear with us, as scanning might take some time, perhaps another 2 - 3 months.
Courtesy of the University of Chicago Library we are able to show 230 scans of the Red Army General Staff maps of Eastern Poland, dated 1939, scale 1:25,000. The maps cover the area of Polish Wołyn (Volhynia) and they were produced, probably, in preparation of the "liberation" of the area in late 1939. The maps are a slight re-scale job of the tsarist, topography survey sheets, so-called half-verst maps (1:21,000), with no evidence of updating. Therefore, it should be assumed they are accurate as per the date shown in the top-left corner, i.e. approx. 1885 – 1905. These maps are rather important, as, in many cases, they are the only detailed map of a given area until, at least 1940.
We don't know the total number of sheets produced in this "block", there could be, up to 600 sheets printed in 1939. Another set of scans, around 100 strong, could become available in the next 2 months.

We have added to Mapster the following scans: 83 sheets o German  1:100,000 map (Karte des westlichen Russlands) and 84 sheets of Austro-Hungarian 1:75,000 map (Spezialkarte). all files are available in 400 dpi and 600 dpi.

• Current (up-to-date) list of German KdwR sheets in Mapster
  

• Current (up-to-date) list of Austro-hungarian Spezialkarte sheets in Mapster

Some sheets present different editions of the maps already available, but others fill in the "blanks" of the index sheets.
Nearly all German editions, and about half of the Austrian maps come from the collection of the map division of the Library of Congress, and we have received them due to hard work at the library done by  people involved in  Topographic Maps of Eastern Europe project - thank you very much!