Popular Science Magazine Vintage December 1969 Piston-Powered Engine ML

POPULAR SCIENCE MAGAZINES LOT of TWELVE (12) vintage, 1969 vinyl COMPLETE year!

Popular Science Magazine Vintage November 1969

Popular Science Magazine December 1969

Popular Science Magazine Vintage July 1969, TRI-DYNE ENGINE, MARS UP CLOSE!

GALAXY SCIENCE FICTION Magazine December 1969

POPULAR SCIENCE Magazine, DECEMBER 1969, PISTON-POWERED ROTARY ENGINE, CITROEN!

Popular Science Magazine December 1969 Piston-Powered Engine ML 070117nonjhe