Frank Norberg, based in Norway, has recently begun posting scanned images of musical instrument trade catalogs and related material on eBay. He was kind enough to email me the following list of titles. As such, this is one of the largest collections of this material I have so far found. Given the length of this list, I suspect that researchers of musical instruments might need to wait a while for the all the works to become available. A quick comparison with what he has so far posted online presents some differences and additions. His website is:
http://stores.ebay.com/Nordbergs-Music-Store
BeriotMethod
Beuscher1935a
Beuscher1937a
BritVega1932
Broadwood1905
Bruckner5
Buescher1923Sax
Cavalier1931
Chanoit1914
Chesbro1948
Conn1915Sax
Conn1919Offers
Conn1930Fl
Conn1934acc
Conn1938
Continental1932
Couesnon1900
Crowest1904
DaleForty
Dallas1938
Davidson1880
Dearman1938
Diapason19171101
Dienst1906
Distin1899
Dupeyrat1910
Dyer51
EMB1928
Engel1908
Epiphone1934
Epiphone1937
Epiphone1941
ESchuster1928
Essex1933Gtrp
Favorite1941
Fetis1864
Feurich1927
Fischer1896Band
Fischer1919May
Fischer1920vln
Fischer1920vlnB
Fischer1925str
Fischer1925vln
Fischer1926Bjt
Fleming1885
Fleming1892
Flesch1929Kunst1
Flesch1929Kunst2
Fletchermnd
FolkDances1
FolkDances1b
Foucher1897
FriedrichBows
FrMartin1935
Gemunder1913Art
Gibson1930road
Gibson1932
Gibson1934gtr
Gibson1935a
GibsonJr
GibsonK
GibsonP
GibsonX
Goddard100
Gordon1897
Gratian1922
Gulbransen1939
HainesCarmen
HammaAG
Hawkes1910Fl
Hawkes1912
Hawkes1925Fl
Hess1940Acc
Hohner1910
Hohner1931art
Hohner1937acc
Hohner1940Wie
HohnerAcc1926En
HohnerChromatic
HohnerM05
HohnerM09
HohnerM25
HohnerM26
HohnerTeacher
HohnerUs1933Echo
HohnerUs1936hrm2
HohnerUsHrm
Holcomb1903
Holcomb19th
Howe1
Howe1900a
Howe1900b
Howe2
IlConcerto1901a
IlConcerto1901alb
IlConcerto1901b
IlConcerto1901c
IlConcerto1901d
IlConcerto1901e
IlConcerto1901f
IlConcerto1901g
IlConcerto1901h
IlConcerto1901i
IlConcerto1901j
IlConcerto1901k
IlConcerto1901l
IlConcerto1901m
IlConcerto1901n
IlConcerto1901o
IlConcerto1901p
IlConcerto1901q
IlConcerto1901r
IlConcerto1901s
IlConcerto1901t
IlConcerto1901u
IlConcerto1901v
IlConcerto1901w
IlConcerto1901x
IlMandolino1901a
IlMandolino1901alb
IlMandolino1901b
IlMandolino1901c
IlMandolino1901d
IlMandolino1901e
IlMandolino1901f
IlMandolino1901g
IlMandolino1901h
IlMandolino1901i
IlMandolino1901j
IlMandolino1901k
IlMandolino1901l
IlMandolino1901m
IlMandolino1901n
IlMandolino1901o
IlMandolino1901p
IlMandolino1901q
IlMandolino1901r
IlMandolino1901s
IlMandolino1901t
IlMandolino1901u
IlMandolino1901v
IlMandolino1901w
IlMandolino1901x
Jedson1930
JenkinsE59
Jiran27
Keefer1924
Kelley1925
KempFolk1899
King1930xmas
KochNews
KohlerTutorial
Kolander1904Mnd
Krakauer1905a
Lafleur1935
Larg1935
Lea1885
Lewis31
Lewis38
Lewis42
Lyon1888a
Lyon1889Band
Lyon1890cBNM
Lyon1890eBNM
Lyon1890fBNM
Lyon1896rov
Lyon1900hsv
Lyon1900rov
Lyon1905Sheet1
Lyon1905Sheet2
Lyon1905Sheet3
Lyon1905Sheet4
Lyon1906Sheet1
Lyon1907rov
Lyon1909rov
Lyon1912rov
Lyon1913rov
Lyon1916rov
Lyon1917a
Lyon1918a
Lyon1918rov
Lyon1919rov
Lyon1921rov
Lyon1922rov
Lyon1924rov
Lyon1929rov
Lyon1932a
Lyon1939pma
Lyon1939pmb
Mason1892org
Matthew1898
MazasMethod
Meinel
Meinel1929
Meinel30
Meister1910
Mennesson1910
MerkeltWzth4
Metropolitan10
Mimasa1929
MP1819Continuo
MSchuster83
NationalBrass4
NSMS1930
Orsi
Paramount1926Souv
Paulus6080
Pepper1910
Pepper1911
Pimpard
Pollmann1897
Porter1879
Prowse1925
Prowse1926
Reichel
Ritter01e
Ritter02e
Ritter03e
Ritter04e
Ritter05e
Ritter08e
Roger1960
Root49
Root51
RootMP0432
Rougier1911
Rougier1912
Rougier1920jan
Rougier1921mar
Rudall1920LBand
Rudall1928L
Rudall1932J
Rudall1934B
Rudall1935I
Rudall1935ICadet
Rudall1938
Rushworth1910
Sadiq1925
Sandys1864
SantosTicklin1d
Schlagel1
Schlagel2
Schlagel5
Schlesinger1910a
Schlesinger1910b
SchumannAid
Schuster1935
Schwenk1923
Selmer1921Souv
Selmer1931Reed
Selmer1935Reed
SelmerUk1934
SelmerUk1964gtr
SelmerUk1968gtr
SelmerUsa1925a
Shelton
Skinner
Smith1881
Smyth1902Mus
Socin1910
Sohmer
Stainer1909
Steck1878
Steiner1900
Steinway1913Royal
Steinway1922Port
Steinway1927lat
Steinway1929
Steinway1929Port
Stewart1956gtr
Story19th
Strobel1900
Studio491960
ThibouvilleE1887
ThibouvilleE1893
Thompson1889
Thompson1891
Thompson1901
Toneking8
Tucek1907
Vega1930Gtr
Veronesi
Virzi
Vitak1931
VitakBargain
VitakBargain1926
VitakBargain1928
VitakBargain1929
VitakBargain1930
VitakDanceFolio
Vitakelsnic1928b
VitakLb2
VitakLb3
VitakLb5
VitakPop
VitakXmas
VoitGeiger1938
Walcker1951la
Warings1934March
Wennerberg1886a
Wennerberg1886b
Weymann1927
Weymann59
WhiteBargain34
Williams1909past
Windsor1927
Wing1893
Wing1911b
Winter1950
Wolf26
Wurlitzer115
Wurlitzer120
Wurlitzer124
Wurlitzer125
Wurlitzer129
Wurlitzer131
Wurlitzer133
Wurlitzer134
Wurlitzer1917vln
Wurlitzer1918vln
Wurlitzer1924org
Wurlitzer1929b
WurlitzerWO462
York1920
York1928
Zimmermann1912pno