RE: co-op plans project ?
Some look awfully similar to the ones freely availablein the RCGroups "Vintage & Old-Timer Plans PRE 1960 PLANS ONLY" thread at:
which is now at over 10,000 messages and4000+ uploaded plans
which are indexed at:
with many plans mirrored and freely downloadable at:
and from Hippocket
and the plans there.
I do not know if that is where some of them came from but one Ilooked at looked very similar.