Gorman, CA: German Research Project, 1989. Offprint. Quarto (28cm.); clear plastic wrappers;  leaves printed on rectos only; illus. Plastic wrappers a bit soiled with old tape repair and sticker, else About Very Good. Offprint of an article first published in the magainze Flugzeug History, February, 1989, with English translation. Unlocated in OCLC as of January, 2018.