Dear Renato,
here you can find old telephone directories for Budapest:

http://adtplus.arcanum.hu/hu/collection/Postamuzeum_Telefonkonyv/

"The Postal Museum has a rich collection of objects, photographs related =
to the post office, the Telegraph and telephony (and later the radio, =
television) in addition to the story, with its unique collection of =
books, among others. These include not only technical aspects of the =
exciting history of phone books, which provide economic and social life =
of a period of kind of a cross section of the well. Family history =
researchers study the benefits as well. =46rom these unique documents =
when we publish a bunch now: publication of the 1906, 1912, 1913, 1914, =
1917, 1920, 1942 and 1943 years and out of Budapest telephone list =
contains the names and professional.

Volume: 6 thousand pages


Best wishes,
Gabor Csanadi