They goofed up the footnote.
Amazing Spider-Man (Vol. 1) #131
Published: c. January, 1974?
Cover Date: April, 1974
“My Uncle… My Enemy?”
Writer: Gerry Conway
Artist: Ross Andru
Inker: Frank Giacoia and Dave Hunt
Letterer: Artie Simek
Colorist: Petra Goldberg
Every deep cut Mary makes you feel because you know how worried she is about him.