HUGE STEM Lot 2 Elenco Snap Circuit kits, 1 Thames and Cosmos set & much more

Description

There is so much in this lot! There are 2 Elenco Snap Circuit sets, the Pro 500 and the 300. There is a large amount of extra pieces as well. It looks like a set, but am not sure. All the pieces look in really good condition.
Also included is a box of Thames and Cosmos Electronics: Learning Circuits. This looks complete, but I honestly have no idea.
The boxes show wear and one of the manuals has a large piece cut off the back cover.