found: Work cat.: Belcarz, B. Avia BH 33 (PWS A), PWS 10, PZL P.7a, 2009.
found: Wikipedia, 13 Jan. 2009:PWS-10 (the PWS-10 was a Polish fighter aircraft, constructed in the PWS, Podlaska Wytwr̤nia Samolotw̤, Podlasie Aircraft Factory; it was the first Polish-designed fighter to enter serial production, built from 1931 to 1932)
found: Virtual Aircraft Museum website, 13 Jan. 2009:Aircraft Directory, Poland, P.W.S. 10 (designed by Aleksander Grzedzielski and Augustyn Bobek-Zdaniewski, the P.W.S.10 single-seat parasol monoplane fighter ...)
