This item, $75 twenty years ago, was on the net recently for $57.
Remember that no single comparison is the whole story. Condition, completeness and provenance must be considered as well. Now you should begin to go through the Leach listings, identify those of interest, select "Click for Detailed Record" and enter some of the details in the Abe [or other] search field. The search results tend to show that there are multiple copies on the web. Of course no book dealer of the pre-internet age anticipated their pricing could or would be carefully analyzed twenty years later. That Mr. Leach's valuations have stood up so well is a testament to his skill. It's a little like handicapping, at a high school graduation, who will be rich by the time they are 40. The "then" and the "now" are in plain sight and very easily compared. Sometimes you know and sometimes you guess.
Every person will obtain somewhat different results because we will search different items in different databases and use different terms in the searches. Mr. Leach's titles are not always reliable while the printer, place and date printed are. In the era before computers there were mimeograph masters that required Jesus' typing skills, Mary's judgment about what would fit on a line and Josephine's help in correcting errors. This simply means we need to be flexible in how we search these records. They are truly PC as in pre-computer.
Here are some random examples of comparisons between these Leach and ABE listings.
Gleason's Pictorial Drawing Room. He offered Vols. 2-5 for $200.00. Single complete volumes now command $300+.
No. 140. Thayendanegea, The Terrible; or, The War-Eagle of The Mohawks. A Romance of Early New York by Ned Buntline. His price was $20. If you wanted it you should have bought it. ABE has fifty million books for sale today but no copies of this one. Mr. Buntline's other volumes seem to be worth about $60. A manuscript of one of his many works is available on ABE for $800.
CHART OF DOMESTIC COOKERY, AND KITCHEN RECEIPT CALENDAR. Particularly Adapted To The Wants Of The Common People. Domestic Economy. [1844] This one was $75.00. I didn't find any copies of this one but I did an additional search for Skinner & Blanchard, the printer and the year 1844. One of their other books was listed and I mention it here in case this is in your specialty:
Every Man His Own Cattle Doctor; containing the causes, symptoms, and treatment of all the diseases incident to oxen, sheep, and swine; and a sketch of the anatomy and physiology of neat cattle. This rarity is $165 but of course it is not the same book.
Swann Maps & Atlases, Natural History & Color Plate Books December 9, 2025
Swann, Dec. 9: Lot 156: Cornelis de Jode, Americae pars Borealis, double-page engraved map of North America, Antwerp, 1593.
Swann, Dec. 9: Lot 206: John and Alexander Walker, Map of the United States, London and Liverpool, 1827.
Swann, Dec. 9: Lot 223: Abraham Ortelius, Typus Orbis Terrarum, hand-colored double-page engraved world map, Antwerp, 1575.
Swann Maps & Atlases, Natural History & Color Plate Books December 9, 2025
Swann, Dec. 9: Lot 233: Aaron Arrowsmith, Chart of the World, oversize engraved map on 8 sheets, London, 1790 (circa 1800).
Swann, Dec. 9: Lot 239: Fielding Lucas, A General Atlas, 81 engraved maps and diagrams, Baltimore, 1823.
Swann, Dec. 9: Lot 240: Anthony Finley, A New American Atlas, 15 maps engraved by james hamilton young on 14 double-page sheets, Philadelphia, 1826.
Swann Maps & Atlases, Natural History & Color Plate Books December 9, 2025
Swann, Dec. 9: Lot 263: John Bachmann, Panorama of the Seat of War, portfolio of 4 double-page chromolithographed panoramic maps, New York, 1861.
Swann, Dec. 9: Lot 265: Sebastian Münster, Cosmographei, Basel: Sebastian Henricpetri, 1558.
Swann, Dec. 9: Lot 271: Abraham Ortelius, Epitome Theatri Orteliani, Antwerp: Johann Baptist Vrients, 1601.
Swann Maps & Atlases, Natural History & Color Plate Books December 9, 2025
Swann, Dec. 9: Lot 283: Joris van Spilbergen, Speculum Orientalis Occidentalisque Indiae, Leiden: Nicolaus van Geelkercken for Jodocus Hondius, 1619.
Swann, Dec. 9: Lot 285: Levinus Hulsius, Achtzehender Theil der Newen Welt, 14 engraved folding maps, Frankfurt: Johann Frederick Weiss, 1623.
Swann, Dec. 9: Lot 341: John James Audubon, Carolina Parrot, Plate 26, London, 1827.
Sotheby’s Book Week December 9-17, 2025
Sotheby’s, Dec. 11: Darwin and Wallace. On the Tendency of Species to form Varieties..., [in:] Journal of the Proceedings of the Linnean Society, Vol. III, No. 9., 1858, Darwin announces the theory of natural selection. £100,000 to £150,000.
Sotheby’s, Dec. 11: J.K. Rowling. Harry Potter and the Philosopher's Stone, 1997, first edition, hardback issue, inscribed by the author pre-publication. £100,000 to £150,000.
Sotheby’s, Dec. 11: Wolfgang Amadeus Mozart. Autograph sketchleaf including a probable draft for the E flat Piano Quartet, K.493, 1786. £150,000 to £200,000.
Sotheby’s, Dec. 12: Hooke, Robert. Micrographia: or some Physiological Descriptions of Minute Bodies made by Magnifying Glasses. London: James Allestry for the Royal Society, 1667. $12,000 to $15,000.
Sotheby’s, Dec. 12: Chappuzeau, Samuel. The history of jewels, first edition in English. London: T.N. for Hobart Kemp, 1671. $12,000 to $18,000.
Sotheby’s, Dec. 12: Sowerby, James. Exotic Mineralogy, containing his most realistic mineral depictions, London: Benjamin Meredith, 1811, Arding and Merrett, 1817. $5,000 to $7,000.