The 1E Fiend Folio was my first D&D book, and the AD&D 2E Monstrous Manual was the book that led me to start playing D&D (and roleplaying generally). So D&D monster books are pretty near and dear to my heart.
Of the ones listed, I have all of them, except the two cover variants of the 1E Monster Manual. I used to have the original, but I had to replace it with the premium reprint a while back (which ought to be listed, BTW, if we're including different covers).
For other editions:
Basic - I don't have the revised Creature Catalog, though I have it in PDF.
1E - Monster Manual II. Also Deities and Demigods, if it counts.
2E - All of the looseleaf Monstrous Compendium Appendices, and all of the paperback ones, except for the Ravenloft Appendix I/II rerelease (which I have as a PDF). I also have all four Annuals.
3E/3.5 - Monster Manual II-V, plus Monsters of Faerun. I was late buying IV and V, however. Also a number of third-party books.
4E - Monster Manual 2 and 3, plus Dark Sun Creature Catalog and Threats to the Nentir Vale. However, I only started buying 4E monster books after Next was announced (with the possible exception of the Monster Vault). In fact, being turned off by the 4E Monster Manual is what convinced me to give that edition a pass.
Pathfinder - Bestiary 2-4, plus the Inner Sea Bestiary. And a number of third-party books.
And I'm loving the 5E book so far, though I've had little chance to look yet.
Of the ones listed, I have all of them, except the two cover variants of the 1E Monster Manual. I used to have the original, but I had to replace it with the premium reprint a while back (which ought to be listed, BTW, if we're including different covers).
For other editions:
Basic - I don't have the revised Creature Catalog, though I have it in PDF.
1E - Monster Manual II. Also Deities and Demigods, if it counts.
2E - All of the looseleaf Monstrous Compendium Appendices, and all of the paperback ones, except for the Ravenloft Appendix I/II rerelease (which I have as a PDF). I also have all four Annuals.
3E/3.5 - Monster Manual II-V, plus Monsters of Faerun. I was late buying IV and V, however. Also a number of third-party books.
4E - Monster Manual 2 and 3, plus Dark Sun Creature Catalog and Threats to the Nentir Vale. However, I only started buying 4E monster books after Next was announced (with the possible exception of the Monster Vault). In fact, being turned off by the 4E Monster Manual is what convinced me to give that edition a pass.
Pathfinder - Bestiary 2-4, plus the Inner Sea Bestiary. And a number of third-party books.
And I'm loving the 5E book so far, though I've had little chance to look yet.