The Talking Machine Forum — For All Antique Phonographs & Recordings

There's a place which gives links to other libraries etc, and thus lists many records and machines catalogues, directly hosted or by means of these links, which can be seen in jpg form page by page, or be downloaded complete in pdf format. I find it most useful and interesting. It is the site of the Spanish Asociación de Documentación Musical, AEDOM, through its section named Matriz. Here's the link:
https://www.aedom.org/catalogosdiscograficos
It can be sorted by several fields, etc.