Undoubtedly WW and his publisher Longman wished to encourage purchasers of RD20 to bind it together with the volumes of WW's verse of similar size that Longman had published since the two-volume P15 (that is, O16, PB19 [here and below implying also PB19(2) as alternative], and Waggoner) to make a uniform third volume. (WD15 would certainly also have been included had its size been uniform.) RD20 supplied a title page and spine label for the purpose (they are quoted in A28), naming all four of the books to be composited thus, and announcing the presence of “Miscellaneous Pieces” in addition. As Eric C. Walker suggests, “Miscellaneous Pieces” was probably inserted in order to increase resemblance of the title to that of the two volumes of P15, which included “Miscellaneous Pieces of the Author.” See Walker's discussion “Wordsworth's ‘Third Volume’ and the Collected Editions, 1815–1820,” PBSA 80 (1986), pp. 437–453; also Owen CSP, pp. 99–101; Wise BWW, p. 90; and Walker's Marriage, Writing, and Romanticism (Stanford, 2009), passim, but especially p. 245n. Wise BWW describes the book as having been bound “in drab paper boards,” but this binding is not mentioned in Wise 2LP.

As noted Owen CSP the publisher's ledger indicates clearly that three copies combining O16, PB19, W19, and RD20 were supplied to WW by the publisher soon after RD20 was printed. The relevant entries for the four books are made, each separately, in Longman Divide Ledger 3 with notes like “in Vol. 3 Poems,” all with dates of 25 Apr 1820, and most with notes “Mr W” (or a “ditto” thereof).