The Development, Design and Construction of Gliders and Sailplanes (1931)
NASA Technical Reports Server (NTRS) · leaf 56
N.A.CA. Technical Memorandum Ho.637 Pigs. 41,42.43,44,45,46 … Pig.45 The second stage,the full Pig.43 Lippisch's all-wing passenger- size two-seat glider. carrying airplane. Pig.46 Lippischfs tailless glider does its trials at the Wasserkuppe.
NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
