primary publishers of this set were the consortium of Longman, Hurst, Rees (who by then apparently held an equity share), Orme, and Brown, of Paternoster Row. However, correct dating by half-volume or fascicle (1802–1820) can have serious implications for the accuracy of citations by modern writers, especially when discussing scientific priority: a list compiled in 1820 in Philosophical Magazine was designed to give proper priority to scientific discoveries. Volumes of plates were issued in blocks, and not with the texts to which they refer. Botanical historian Benjamin Daydon Jackson, unaware of this list, attempted to compile a list based on contemporaneous advertisements in the trade press, on dates appearing on the plates (having assumed that the plates were issued at the same time as the accompanying texts), and some guesswork. He published his first list privately in 1877, he issued a corrected version in 1880, and a final version appeared in the Journal of Botany in 1896. Only 3 of Jackson's dates accord with the 1820 dates listed above. Citation style Hundreds of articles in Rees are very long, and the work is unpaginated, so page reference is not easy. The following convention was adopted by the Rees Project, and is based on the method described by R. B. McKerrow. Each gathering has 8 pages, and each page 2 columns. The reference is cited by volume or half-volume details with accurate date between 1802 and 1820, article title, and then the gathering's identifier, the page, and the column, separated by colons. The page containing the gathering identifier (e.g., "B") is page 1 in each gathering (e.g., page "B:1"). Page 3 in each gathering typically contains the gathering identifier plus the figure 2 and should be ignored (e.g., "B2" appears on page "B:3"). The account of the bell-crank steam engine may be referenced as "" ("O" is the 8-page gathering's identifier.) The gatherings in a typical volume of Rees are identified as follows. In each sequence the letters J and W are omitted and one letter U or V used but not both together. 22 running from "B" to "Z" 23 running from "Aa" to "Zz" 23 running from "3A" to "3Z" 23 running from "4A" to "4Z" 23 running from "5A" to "5Z" or as far as needed The David and Charles reprint of some of the manufacturing articles is paged, and many writers cite this pagination, which is useless