HARRISON TAPE GUIDE, USA
The HARRISON TAPE GUIDE are the most comprehensive source of information on reel to reel commercially made tapes. With 1000’s of tapes listed, these catalogs document 2 Track and 4 Track issues from 1956 to 1976.
The name of these catalogs changed 5 times in the 20 years of publication:
THE HARRISON CATALOG OF RECORDED TAPES,
THE HARRISON CATALOG OF STEREOPHONIC TAPES,
THE HARRISON CATALOG OF STEREO 4-TRACK TAPES,
THE ALL-INCLUSIVE HARRISON TAPE CATALOG and finally
HARRISON TAPE GUIDE.
Thank you to Eric Galzi for the information.
Below: August 1974.
ALBANIA (1) 
In ARABIC (3) -3 countries 
BULGARIA (2) 
In CATALAN (5) -Spain
In CHINESE (12) -2 countries
CROATIA (4) 
CZECH REPUBLIC (14)
DENMARK (12) 
In DUTCH (77) -2 countries
In ENGLISH (913) -24 countries
FINLAND (17)
In FRENCH (134) -5 countries
In GALICIAN (1) -Spain 
In GERMAN (147) -4 countries
GREECE (19)
in HUNGARIAN (8) -3 countries
ICELAND (9)
IRAN (1)
ISRAEL (9)
In ITALIAN (94) -2 countries
JAPAN (66)
LITHUANIA (1)
NORWAY (49)
POLAND (15)
In PORTUGUESE (52) -3 countries
ROMANIA (7)
In RUSSIAN (5) -2 countries
In SERBIAN (5) -2 countries
SLOVAKIA (1)
In SPANISH (193) -14 countries
SWEDEN (29)
THAILAND (3)
TURKEY (21)