Hundreds of on-line documents, photos and books at the Esperanto Museum of the Austrian National Library:
http://www.bildarchivaustria.at/Pages/ThemenResult.aspx?p_iKlassifikationID=12898868&p_iDatum=1910&p_iCollectionID=12898792&p_iSubKlassifikationID=12904380
One can enlarge image hitting the plus sign under the picture, photo or object.
Oni povas grandigi imagon klakante sur plus signon sub bildo, foto, aŭ objekto.