ATK 20mm to 45mm Cased Telescoped Ammunition (CTA)

I just received this ATK set of 50 data cards of small, medium and tank ammunition, all of them dated October 2000. They measure 4x3" (10.2x7.5cm) and most show well known loads in US military calibers, with few exceptions. One of the them is this one describing CTA ammunition:

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Whoa! How did you get the cards? It’s interesting to compare the telescoped cartridge ideas of (nearly…) 20 years ago to today.