_c_: latent, veiled, repressed or implied homosexuality of a major character. _d_: brief, superficial references in dialogue or exposition, whether involving major or minor homosexual characters. _e_: third-person references (character not in book); latent, veiled homosexuality of minor character in work of a significant author. _f_: false suspicion or accusation, or self-suspicion. In some cases, where use of one letter alone would give an inadequate impression, several are used in combination, e.g. _c/d_ or _b&c_. All letter symbols are found on the OTP listings to the left of applicable work. The order follows that of the Primary, but without consecutive numbering. It does not by any means follow that all works which by definition are “Primary” are necessarily more significant, even with respect to substantial homosexual content, than all OTP works. To provide some further guidance, references (to the left) include the follow asterisk notations, uniform to both Primary and OTP listings: *** Very substantial ** Quite substantial, or something of especial interest * Not very substantial (no asterisk) Rather negligible It must be emphasized that literary merit, or interesting material of a non-homosexual nature, are _not_ prime considerations in determining the asterisk rating, which refers only to homosexual content. Reprints are cited wherever known, especially inexpensive paperbacks. In this connection, the following abbreviations are used: Pb: Paperback of the conventional size (approximately 4.5 × 7"). Most names are written out (Avon, Signet, Bantam, Popular etc.). However, where space is limited: Perm is “Permabook”; PB Pocket Book; PL Pocket Library Lpb/LPb refers to odd-size cheap paperbacks, popular in the early 1950s, roughly 5.5 × 7.5", with flexible cover (e.g. Universal, Croydon) PbO or LPbO indicates work originally published in this format, with no prior “regular” edition. This is further indicated by publication date following serial number (not usually given for paperback reprints). AFE/ASE refers to a third type cheap paperback, used by Armed Forces. PC (Paper Covers) indicates “quality paperback” or paperback original by regular-book publisher in U.S. or Europe. In this group, MLP stands for Modern Library Paper.