"The 1000 Secrets of the Batcave"
Reprinted from Batman #48
"Billy"
a 1/3 page humor shor by Henry Boltinoff
"The Birth of Batplane II"
Reprinted from Batman #61
"Secrets of the Batcave:1968"
Various reprint panel art depicting the layout of the Batcave and various bat-devices.
"The Secret of Batman's utility belt"
Reprinted from Detective Comics #185
"The 100 Batarangs of Batman"
Reprinted from Detective Comics #244
"The Secret of the Batmobile"
Reprinted from Batman #98
"The Flying Bat-Cave"
Reprinted from Detective Comics #186
This is G-49, G-48 was Superman #207 and G-50 will be Jimmy Olsen #113