Copyright © 1974 Poptronix, Inc.; used by permission.
This issues was published on Friday, November 29, 1974.
Here is a picture of the copyright catalog entry at the Library of Congress.
Popular Electronics was always published the month before the cover date, readers got this issue in early December 1974.
Altair 8800 Computer
Edward Roberts and William Yates
Each page is a 150 dpi jpg image.
300 dpi tiff files are available.