I found this German company that offers several volumes of philatelic literature on the eBay sales platform.
Volumes also of some importance, in my opinion certainly offered at an out of market price, really expensive.
For collectors with good financial resources.
Evaluate You !
https://www.ebay.it/sch/philcreativ/m.html?
ssPageName=STRK%3AMEFSXS%3AMESOI&_trksid=p2053788.m1543.l2654
https://www.ebay.it/str/philcreativ
Friendliness !
Franco
