[ModLib] ISBN numbers on DJs covering bindings BELOW #14?

[Scot Kamins]

Folks,

Ron Holl and I have been discussing bindings (again). The current  
topic is ISBN numbers. As far as research tells me, ISBN numbers  
started appearing on ML DJs AFTER 1970. Also, 1969-1970 was the  
period of the #14 bindings (the tall ones). I was suggesting that all  
books having DJs with ISBN numbers in the 1971-1975 period must have  
#14 bindings.

So the questions are:

1) Is it true, as research in the archives would indicate (and I'll  
be glad to quote the source if you need it), that only ML books  
printed AFTER 1970 have ISBN numbers?

2) Are there any DJs NOT in the taller (binding 14) format with ISBN  
numbers on the back?

Scot Kamins
............
"If voting changed anything, they'd make it illegal." -- Emma Goldman