The catalogue that makes my knees go weak is that of Hinck and Wall, antiquarian booksellers with a specialty in garden history. (They also, enviably, own the url gardenhistory.com).
If-wishes-were-horses-and-beggars-could-ride I might choose to own the entire 1913-1969 run of the super-luxe French garden periodical LA GAZETTE ILLUSTRÉE DES AMATEURS DE JARDINS at $8000 the set. Hand-colored plates, high quality photographs, and occasional watercolors, and the source of the lovely image above, another of my Art Deco gardens. Note the stepped 'Aztec' arches; a recurring Deco motif.
Steep prices, but beautiful historic volumes...if you can afford these I envy you.
Oh for pots of money for piles of books!