It is possible to view the table of contents for a number of magazines at Musclememory.com. When you click on the scan of the cover person it also brings up the table of contents. Since this a labor in progress, not all content pages are available.
Here are two sources for magazine sleeves and backing boards for storing magazines:
Larry E. Krein Company
3725 Portland Avenue S
P O Box 7126
Minneapolis, MN 55407
612-824-9422
800-470-3799
EEZEE Products
1595 Central Street
Stoughton, MA 02072
781-341-3640
info@packagingandmore.com