These models are part of a series of booklets issued by the "Deutscher Militarverlag" of the DDR during the 1960's.
Some of the booklets contain black & white negatives of paper models.
I purchased these booklets on ebay.de, printed the negatives and
scannned and edited the models on the computer.
The models are of good quality, but it's difficult to distinguish part numbers and lines, because it's difficult nowadays to get good quality
prints from these negatives.