found: Book dealers' catalogues from the Lane Collection, 1870-1887:v.7, 7th t.p. (M. Thomas & Sons Auctioneers)
found: Splendid mansion and elegant furniture of Howard Tilden, Esq. including fine paintings, marble statuary, etc., 1858 (viewed online November 30, 2022):cover (M. THOMAS & SONS, AUCTIONEERS [all capitalized, on same line]) page 4 of cover, etc. (M. THOMAS & SONS, Auctioneers [name all capitalized, "Auctioneers" on separate line as a descriptive phrase])
found: Catalogue of a valuable collection ... the collection of Mr. Robert S. Davis, 1901:title page (M. Thomas & Sons' Art Galleries, 1519-1521 Chestnut Street) title page verso (M. Thomas & Sons) cover (M. Thomas & Sons' Galleries, 1519-1521 Chestnut Street)
found: Worldcat, searched Februrary 27, 2023(access point: M. Thomas & Sons Auctioneers; M. Thomas & Sons; M. Thomas & Sons' Galleries, Philadelphia; M. Thomas & Sons' Galleries; M. Thomas & Sons, Philadelphia; Thomas & Sons, auctioneers; usage: M. Thomas & Sons; M. Thomas & Sons, Auctioneers ["Auctioneers" as a descriptive phrase]; M. Thomas & Sons' Galleries; Thomas & Sons; M. Thomas & Sons' Art Galleries; Thomas & Sons, auctioneers)
found: Old SCIPIO authority file, accessed December 5, 2022(access point: M. Thomas & Sons' Galleries, Philadelphia; variant access points: M. & S. Thomas (1823); M. Thomas (1828-32); M. Thomas and Son (1836-47); years of operation: 1823-1906; place of sale: Philadelphia)
found: Archives Directory for the History of Collecting in America, viewed December 14, 2022(M. Thomas & Sons Auctioneers; auction house; as known as M. Thomas & Sons' Galleries, operated in Philadelphia; 1823-1906)
found: Biographical encylopaedia of Pennsylvania, 1874, viewed online February 22, 2023(Thomas, Moses; publisher, bookseller, and auctioneer; born, Frankford, Philadelphia County, 1787; died August 15, 1865; in 1828, with brother, founded auction and commission house, M. & S. Thomas, originally located at no. 87 Chestnut Street; after retirement of his brother, carried on business in the name of M. Thomas alone, succeeded by M. Thomas & Sons, two sons assuming responsibilities in the business; moved business to building on Fourth Street, below Chestnut)
found: Catalogue of splendid and rare green and hot-house plants, 1839, viewed online Februrary 22, 2023:title page (M. Thomas & Son, auctioneers)
