found: Marks, G. W. Potpourri aus Tannhäuser von Wagner:Caption (Potpourri aus Tannhäuser von Wagner / G. W. Marks)
found: Hofmeister XIX, March 14, 2016(use of the pseudonym appears to have been exclusive to the Hamburg publishing house of August Cranz, publishing 256 of the 268 items by "G. W. Marks" published between 1831 and 1900)
found: Daub, A. Four-handed monsters, 2014:page 59 ("Marks" was an identity that a number of namelss hirelings--among them, in all likelihood, a young Johannes Brahms--assumed when writing arrangements and potpourris for Cranz)
found: IMSLP, March 14, 2016(apparently a pseudonym used by several publishers for a number of composers, typically for the type of operatic arrangements featured. Among others, it was used by Johannes Brahms. Some of the works attributed to Marks could be by Brahms, but there are other works by G.W. Marks (mentioned in Hofmeisters Monatsberichte) which [are] so early (e.g. an Op. 54 published in 1837) that Brahms would have had to have been composing and publishing as an infant to be responsible for them. Still other items using the name appeared as early as the 1820s. The date range given above represents the period when new issues using the name appeared. The last publication by G. W. Marks listed by Hofmeister up to their 1900 issues is in their June 1900 issue)