Trade promotion series
G.P.O
マイクロ形態(マイクロフィルム (リール))
by W. Rodney Long
U.S. G.P.O. 1939 Trade promotion series no. 196
所蔵館4館
by Jesse E. Saugstad
U.S. Govt. Print. Off. 1932 Trade promotion series no. 129
所蔵館8館
by M.M. Smith and J.N. Taylor
U.S. Govt. Print. Office 1929 Trade promotion series no. 86
所蔵館1館