This first-line index to Arthur Case's Bibliography of English Poetical Miscellanies, 1521-1750 was a collaborative project of Richard Charles Boys and Arthur Mizener. They had gone through the miscellanies listed by Case, writing down the first line of each poem on a slip of paper and stamping the slip with the Case item numbers, making notations of variant forms on the same line on the front or back of the slip, and sometimes noting the author.