Compact Cassette tape types and formulations - Wikipedia
C-39 Old Computer Color Audio Cassettes with Vintage Super Ferro Music-Grade Audio Tape and Case - Pre-Loaded Type I Cassettes - Audio Cassettes
C-58 Transparent Audio Cassettes with Vintage Super Ferro Music-Grade Audio Tape - Pre-Loaded Type I Cassettes - Audio Cassettes
Vintage audio cassette deck collection - 1001 HI-FI - Vintage Audio and More.
Sage Audio
1984 Tape Recording Guide, PDF, Sound Recording And Reproduction
BASF 90 Ferro Extra I IEC I Vintage Audio Cassette Tape : Home & Kitchen
Blank Cassettes: Audio - Universum - Ferro Super I - C - 120 - Germany (1977)
C-57 Silver Audio Cassettes With Vintage Music Grade Tape - Pre-Loaded Type I Cassettes - Audio Cassettes
C-68 Super Ferro Music-Grade Black Cassettes 50-Pack - Pre-Loaded Type I Cassettes - Audio Cassettes
Blank Cassettes: Audio - Universum - Ferro Super I - C - 120 - Germany (1977)