found: Work cat.: Belcarz, B. Avia BH 33 (PWS A), PWS 10, PZL P.7a, 2009.
found: Wikipedia, Jan. 13, 2009:PZL P.7 (PZL P.7; a Polish fighter aircraft designed in the early 1930s in the PZL factory in Warsaw; adopted by the Polish Air Force in 1933 as its basic fighter; one of the first all-metal monoplane fighters to be mass-produced with state-of-the-art construction; however, by the end of the decade, the P.7 was obsolete and was replaced in Polish service by its follow-up design, the PZL P.11c)
found: Virtual Aircraft Museum website, 13 Jan. 2009:Aircraft Directory, Poland (PZL P.7)
