Some interesting information on card number 6 you posted. Card 6 depicts the Boeing 100 which talks about its "commercial use"....the fascinating angle here is only nine Model 100's were ever produced (the civilian model as opposed to the military designation). Model 100A (one-of-one) was bought by Howard Hughes in July 1929 and extensively modified with assistance from Dick Palmer. Hughes could easily outperform the military version, and frequently did so. In Janaury 1934 Hughes entered his Boeing 100A at the Miami Air Races and won his first trophy. Hughes all but lapped his nearest competitor. Hughes was not satisified with 200mph and Glenn Odekirk suggested to Hughes that he design/build his own plane. Hughes and Dick Palmer (a Caltech physics Engineer)came up the the H1 Racer (now on display at the Smithsonian), the fastest landspeed plane ever built(until the mid-forties).
I don't have a Holloway R7 Number 6 and did not know it existed. It's not too early to be thinking of Christmas gifts for folks down in Houston...we love gifts...allen
(and yes, I'll put a post in the B/S/T/G (gifts) section)