The Nursery Rhyme transfers were almost certainly 'open-stock' and made by Johnson, Matthey. There would not have been different types of transfers made for glass and ceramics, and they were made specifically for ceramics. Because of the lower-firing temperature required for glass, the only real problem faced by Chance (and other glass makers) was that some colours (reds in particular) could turn rather 'muddy' and it would often require a few test samples to establish the correct temperature to use – or not to use the transfer at all.
See: p.83, Making Fiestaware / Application of Patterns / Transfers, second column.
As for crediting people, there is a limit as to how far one should go. After all, I did acknowledge "those kind folk on The Glass Message Board" and, "Sincere thanks to everyone who offered support." before detailing a huge raft of people who had been of particular help. Is saving a newspaper cutting, a sufficient reason to mention your niece? I was already collecting Chance glass at this stage and there is mention of this in another thread somewhere (I posted a photo of a white Gingham handkerchief vase).