Type HCO Hard Covers

Title on the spine only

Contains pamphlet Type 6

Hard Cover Type HCO is a less often seen hard cover and was likely short-lived, since the title appears only on the spine. Spine printing colors, fonts and contents vary, and variations cannot yet be worked out from the limited number seen. Until there is more clarity it remains a loosely defined group. Despite the differences in the spine, there are two distinct cover designs: Variation 1 in dark blue ink and Variation 2 in white ink. HCO covers are only known to contain Type 6 pamphlets at this time.

3 known titles, 0 pictured. New titles are added as they are found and confirmed.