1a.  Clarence Almon Torry.  1985.  New England Marriages Prior to 1700.  New England Historic Genealogical Society, Boston, MA (reprinted 1997, Genealogical Publ. Co., Baltimore, MD):

The "b" indicates the birth date of a child as an indication that the marriage took place before this time.  The locations are known residences of the husband, ending with the husband's place of death.  An entry in Torrey does not imply a marriage in New England; it only demonstrates the presence of a married couple there before 1700.  Torrey is a compilation of published sources, not primary records, so he should be considered a secondary source.

p. 109

BROWN, Thomas (-1688) & Bridget __?__; b 1642; Concord/Cambridge... BROWN, Thomas (-1690, 1691) & Martha (EATON) OLDHAM (1630-), w Richard; 7 Oct 1656; Cambridge

1b.  Clarence Almon Torry.  2015.  New England Marriages Prior to 1700.  New England Historic Genealogical Society, Boston, MA (repuslished; online at AmericanAncestors.org):

p. 256

BROWN, Thomas (-1688) & Bridget _____; by 1642; Concord/Cambridge {Brown (#3) 6; Sv. 1:276; Brown (1931(ms) 7; Fallass 106; Davis-Everett 44; Chandler (1949) 27; Morton (1947) 43}... BROWN, Thomas (-1690, 1691) & Martha (EATON) OLDHAM (1630-), w Richard; 7 Oct 1656; Cambridge {Cambridge 502; Watertown 202; Sv. 1:276; Brown (1931)(ms) 9; Eaton 275; Townsend (#6) 31; Reg. 76:73; LBDF&P #310; Morton (1947) 42-3}

p. 1110

OLDHAM, Richard (-1655) & Martha [EATON] (1636-), m/2 Thomas BROWN 1656; by 1649; Cambridge (Brigham Anc. says Martha Sherman) {Reg. 76:73: Brigham Anc. 41, 47; Brighton Hist. 198; Eaton Fam. Assn. 19; Watertown 202}

Also in this recent edition, two Thomas BROWNs continue to be recognized here.

2.  James Savage.  1860-62.  A Genealogical Dictionary of the First Settlers of New England Showing Three Generations of Those Who Came Before May, 1692.  4 vols.  Little, Brown, and Co., Boston, MA (online at Ancestry.com and GoogleBooks.com; color and boldface added):

p. 276

THOMAS, Concord 1638, perhaps br. of Rev. Edmund, being among orig. proprs. of Sudbury 1637, freem. 14 Mar. 1639, by w. Bridget had Boaz, b. 14 Feb. 1642; perhaps Jabez, 1644; Mary, 26 Mar. 1646; Eleazer, July 1649; and Thomas, 1651.  His w. d. 5 Jan. 1681, and he rem. prob. to Cambridge, d. 3 Nov. 1688. THOMAS, Cambridge, m. 7 Oct 1656, Martha, wid. of Richard Oldham, had Mary, b. 28 Apr. 1658, d. young; Mehitable, 13 May 1661; Mary, again, 1 Nov. 1663, prob. d. young; Ebenezer, 15 Jun 1665; Ichabod, 5 Sept. 1666; and Martha, 19 Oct. 1668; and d. Dec. 1690.  His will of 23 Nov. preced. ment. the w. and four ch.

Savage, too, recognizes two Thomas BROWNs.

3.  Massachusetts Vital Records to 1850: Cambridge Births (online at AmericanAncestors.org):

Vol. VI, p. 97	BROWN... Mary, d. of Thom[a]s and Martha, Apr. 28 1658...
Vol. VI, p. 98	BROWNE... Ebenezer, s. of Thomas and Martha, June 15, 1665... Icabod, s. of Thomas and Martha, Sept. 5, 1666... Martha, d. of Thomas and Martha, Oct. 19, 1668...
Vol. VI, p. 99	BROWNE... Mary, d. of Thomas and Martha, Nov. 1, 1663... Mehettabell, d. of Thomas and Martha, May 13, 1661

4.  Charles Henry Pope.  1900.  The Pioneers of Massachusetts. C.H. Pope, Boston, MA (republ. 1965/98 by Genealogy Publ. Co., Baltimore, MD; Broderbund CD-504; online at Ancestry.com; Kindle e-copy sucks; paperback copy from NEHGS; boldface and color added):

p. 75

Thomas, Sudbury, propr. 1640.  The Gen. Court 7 (8) 1640, granted him 200 acres of land for the 25 li. adventure of Mrs. Anne Harvyes.  He seems to have rem. to Concord, where by wife Bridget he had ch. Boaz b. 14 (12) 1641, Mary b. 26 (1) 1646, Eliezer b. 5 (3) 1649.  He is clearly the man who was adm. chh. Cambridge May 18, 1666; had m. before 1658 Martha, widow of Thomas Oldham; ch. Mehitabel bapt. June 2, 1661, Mary bapt. March 8, 1663, Ebenezer bapt. July 23, 1665, Ichabod bapt. Sept. 9, 1666. [Mi.] Will dated Nov. 23, 1690, prob. in Jan. folg., beq. to wife Martha, daus. Mehitabel and Martha, and sons Ebenezer and Ichabod. The inv. shows house and land in Camb. and 300 acres at Worcester.

It appears Pope may be the source of the error equating the two Thomas BROWNs.  It's not insignificant that he omits death dates for both Bridget and her husband because those would have pointed up his error in equating the two men.  Note, also, that none of Bridget's children are mentioned in the will.

5.  Brian Freeman.  Our Family History and Ancestry (online at family.dumhop.com):  the pedigree for Thomas is undocumented, and I'm told by the site owner that the information was obtained from Sonia Abate.

6.  WorldConnect / Ancestry World Trees (online at RootsWeb.com/Ancestry.com).