I added a new layer to the topo maps that add 15 minute quads from the late 50's and early 60's.  The layer comprises the following quads:

• Colton
• Fish Creek Mtn
• High Rock
• Mt Wilson
• Mill City
• Battle Ax
• Breitenbush
• Fort Butte
• Quartzville
• Detroit
• Mt Jefferson
• Whitewater

The new layer shows up on the menu here:

If you have questions or problems, please let me know.