Recycled Paper Products Calendars
Sandra Boynton created calendars for Recycled Paper Products from 1979 to 1995.
She did one calendar (that I know of) for Portal Publications in 1999.
She also did a line of calendars through her book publisher, Simon & Schuster (Workman Publishing), beginning in 1998. Some of these are the "Mom's Family Calendar" still being produced today.
These are most certainly NOT all the calendars she ever did. If you have a Boynton calendar that's not listed, please let me know. Also, if you can provide pictures or scans of the calendar pages, I'll post them here with a credit to you and my extreme gratitude.
Please note: If the thumbnail isn't up, that page isn't ready yet. If the thumbnail says "need images", that's one I know about but don't have, and would like to get pictures or scans.