In my earliest tree climbing days, folks worked on writing down their family stories. Documentation was the foundation to success, and the Library of Congress was such a place to find genealogies written by others. There were only a few that dealt with the Jones surname from Wales. The following are those existing here as listed in "Genealogies In The Library of Congress A Bibliography" edited by Marion J. Kaminkow, Magna Carta Book Co., Baltimore, MD, 1972.
"9393 JONES. Pedigree of Jones, Wern, parish of Penmorva, county of Carnarvon. (London, 1877) (3) p. coat of arms. 29 cm. Communicated by William Watkins Edward Wynne. Caption title. Also in Miscellanea genealogica et heraldica. new series, vol. II. p. 249-251. 9-19350. CS459.J7"
Let's see now, the first four numbers represent the coding location it was given prior to 1972. This is followed by the title of the reference and its date of publishing. Other information regarding the number of pages, author(s), special contents, and other sources which contain the same item. The final letter-number combination is the Dewy Decimal like system applied to this reference. The few other references recorded 1972:
"9411 JONES. Genealogy of the Jones family; first and only book ever written of the descendants of Benjamin Jones who immigrated from South Wales more than 250 years ago... By George Russell Jones... Los Angeles, Cal., Times-mirror prg. & bdg. house (c. 1912) 85, (19) p. front., ports, , facsim. 18 cm. 19 p. at end for 'Memoranda.' 12-11738 CS71.J76 1912."
"9416 JONES. The Jones family; five generations from Francis Jones, of Pembrokeshire, Wales, to Richard Mott Jones, of Penn Yan, New York. Complied by Albert Brill Russell. Ilion, N.Y. (1924) 24 p. ports. 23 1/2 cm. Based upon research made 1924, by Alfred R. Justice. Pages 23-24 left blank for "Addenda. 25-4510 CS71.J76 1924a"
"9436 JONES. A tree grew in Wales. By Mable (Jones) Wayland. (San Jose? Calif. 196-?)
100 p. illus. 28 cm. Includes bibliographies. 63-28074. CS71.J76"
[Note the last two call numbers are the same as that above. This must have been the fact that they were all grouped together in the same file location?]