The most extensive and invaluable bibliography (2,799 entries) dealing with the Subcarpathian Region is the one compiled by:

Nykolai Lelekach and Ivan Haraida (19??-1945), Zahal'na bybliografiia Podkarpatia [A General Bibliography of the Subcarpathian Region] Ungvar (Uzhhorod), 1944.

Two annotated bibliographies in the collection includes items published before 1900 and during the period 1975-1984:

Ivan Levitskii (1850-1913), Galitsko-russkaia bibliografiia XIX-go stolitiia [Galician-Rusyn Bibliography of the Nineteenth Century], vol.1-2, L'viv, 1888-1895, and his
Galitsko-russkaiia bibliografiia za 1887 [Galician-Rusyn Bibliography for the Year 1887], vol.1-3, L'viv, 1888-89, and also his
Ukrains'ka Bibliografiia Avstro-Uhorshchyny za roky 1887-1900 [Ukrainian Bibliography of Austria-Hungary for the Years 1887-1900], vol.1-3, L'viv 1900,

Paul R. Magocsi (b.1945), Carpatho-Rusyn Studies: An Annotated Bibliography, vol.1 1975-1984, [New York, 1988].
See also: Paul R. Magocsi and Olga Mayo, comp., Carpatho-Ruthenica at Harvard: a catalog of holdings, Englewood, NJ, 1977.

There are two bibliographies dealing exclusively with the Lemko Region:

Tadeusz Zagórzanski [pseudonym], £emkowie i £emkowszczyzna, Materialy do bibliografii [Lemkos and the Lemko Region, Materials for Bibliography] Warsaw, 1984;

Marian Jurkowski, "£emkowszczyzna (materialy do bibliografii)" [The Lemko Region (Materials for Bibliography)] in: Slavia Orientalis, XI, 4 (Warsaw, 1962), p.240-254.

Bibliographic aids on the history of Carpatho-Rusyns in America could be found in:

"Carpatho-Rusyns",
in: The Immigrant in America: Guide to the Microfilm Collection, vol.4, Woodbridge, CT, 1987, Reel 146;
Edward Kasinec (b.1945), The Carpatho-Ruthenian Immigration in the United States: a Preliminary Note on Sources in Some U.S. Repositories, [Fairview, NJ, 1981].

Finally, among general introductory reference guides there are:

Evgenii Perfetskii (1888-1947), "Obzor ugrorusskoi istoriografii" [A Survey of Ugro-Russian Historiography], Izvestiia otdeleniia russkogo iazyka i slovesnosti Imperatorskoi akademii nauk [Izvestiia ORISIAN], XIX, 1 (St. Petersburg, 1914), p.291-341;

Paul R. Magocsi, An Historiographic Guide to Subcarpathian Rus', Cambridge, [1974];

IUlyan Kolesar (1927-1992), Ystoryografyia u rusnatsokh [Rusyn Historiography], Montreal, 1980;

Paul R. Magocsi, Galicia: A Historical Survey and Bibliographic Guide, Toronto-Buffalo, 1983.