Please view all pics and use the zoom feature.  Pics are a large part of the description.  As found.  There are 64 slides in total.  They are numbered but may not be in proper order and may not have all the slides of the sequence.  They may be from different races, but I'm not sure.  The best I can make out on the imprint on the cardboard is July 1970.  They come in the slide holders that I found them in.  These were part of an estate and were found with other racing slides.