Visits abroad to workshops I visited several restoration studios which resulted in tight connections with conservators and restorers in:

Sweden
Stockholm ( Kungliga Biblioteket, Riksarkivet); Uppsala (University Library Carolina Rediviva , Lars Munkhammer and Per Cullhed)

USA
Cornell University, Ithaca (Paper restoration workshop, Tatyana Petukhova & Preservation an conservation Department, John F.Dean ); Library of Congress , Washington (restoration lab of Thomas C. Albro ); Johns Hopkins University Baltimore, Preservation Department (Martha Jackson); Folger Shakespeare Library Washington, Preservation Department (Franklin Mowery)

Finland
Helsinki (University Library & National Library)

France
Strasbourg (Archives Municipales, Bernard Santoni)

Denmark
Copenhagen (Coli'bri, Ole Olsen)

Israel
Jerusalem (Israel Museum; Jewish National University Library; Holocaust restoration Department Yad Vashem; Rockfeller Museum Scrolls restoration Department)

Japan
Tokyo (conservation studios of Mari Yamaryo & Masako Koyano, National Diet Library Preservation Studio, Mounter Studio Takahashi Akira, Ntl.Res.Inst. of cultural properties); Kyoto (Oriental Art conservation, Main Conservation Center, Kyoto National Museum, Karacho Paper Studio of the family Senda, Katsura Villa); Yamagata (Tohoku Art University , Masahiko Tsukada); Yokoyama (Conservation studio Kuroe); Fukui-Japan (Washi Workshop Ichibei Iwano); Ryogoku (Edo Tokyo museum)

Italy
Padova (Officina creativa, Callygraphy and bookbinding studio, Sabino Tito Manlio)

The Netherlands
Den Haag (Koninklijke Bibliotheek, J.Wim H. Smith)

Finding people in and around Conservation consult a page which has tools for finding people involved in the conservation and allied professions. It is haused and managed by Conservation OnLine (nickname "CoOL"): Resources for Conservation Professionals.