Book: Noel Hume, Ivor. 2001 If These Pots Could Talk: Collecting 200 Years of British Household Pottery.
• Discussion of "GR" Westerwald jugs and mugs: pp. 108-109, figs. V.20-V.23Manuscript: Findlen, Suzanne Rae. "Taste and Choice in Early Portsmouth New Hampshire as Seen Through Ceramic Archaeological Evidence, 1700-1800" (MA thesis).
• Westerwald mugs with blue decoration excavated Deer Tavern, Strawbery Banke, NH: p. 97, no. 153 (A-0888 DS5.5.110), 1750-65 privy context; no. 154 (A-0900 DS5.5.F120), 1690-1720 well contextCatalogue: Hinton, Jack. 2012 The Art of German Stoneware from the Charles W. Nichols Collection and the Philadelphia Museum of Art.
• Westerwald jugs and mug with "GR" and varied ornamental motifs: p. 47, pl. 32, cobal and (one) manganese decoration.Book: Noel Hume, Ivor. 1969 Archaeology and Wetherburn's Tavern.
• Cylindrical "GR" mug excavated at Wetherburn's Tavern, Williamsburg, Virginia: p. 29, fig. 17