Boy that's a dirty job, ripping out the interior vinyl, still have a lot to go though.
For information, according to their markings on the vinyl inside the Playpac, the brand used was NAUOLEX.
This according to google search is a marine grade vinyl, used on boats. This is still available for sale
in a wide variety of colors and patterns. It appears to be put on primarily by NAUOLEX brand of adhesive possibly called #88. It had to be a pretty potent adhesive to have held on so well since 1973.
Now I know what I have in my hair, dried glue residue, dirt, dust, dead bug parts - I think I need to clean up.
Well if you wanted to know about bio-hazard of materials - this is what was probably used. If I need to do any gluing I will probably look for a modern version of this formula from the company, 45 years is a long time for glue to stick