The scans from here differ from the ones on the Internet Archive. These are lower quality (Marks on pages, yellower, compression artifacts, bleed through, inconsistant page sizes) but as a result are much smaller. They are watermarked on each page. This archive also seems more complete than the IA one.
Also the ones on world radio history are searchable. They have a search feature on their website to search all their documents as they have all been OCR'ed.