When you collect little pieces of old paper you sometimes run into items that become problems. Either you cannot identify them or your identification cannot be complete because of a lack of an outside verifying source. Such is the case with these "stamps." Here is what I can tell you about them.
In October of 1946 the Los Angeles City School District was the recipient of a gift from the Los Angeles Times newspaper. This gift was in the form of a book entitled "El Camino Real," and it was given to all 7th grade students in the Los Angeles City School District. This text was accompanied by a series of 65 color stamps that corresponded with the lesson being studied. When the lesson was completed the stamp would be placed in the appropriate place in the book.