The so called "closed" or folded letters - single sheet letter / cover combinations - were known by Soviet citizens as "triangles" as they were usually triangular in shape when folded; these were used as wartime expediency in lieu of regular envelope covers. They were nevertheless decorated on the outside with patriotic artwork, same as the more conventional envelopes.

The catalog contains over 500 color photos of the examples of these letters and envelopes, all with prices in rubles (divide by approximately 30 to get the US$ price as per 2012 exchange rate). The catalog is conveniently organized by the featured artwork (e.g. tanks, cavalry, partisans, Victory Day etc). This price guide is an invaluable tool for a Russian envelope collector.