Contains "coupon bonds," or annuity coupons, issued to Hermann Iancu and Jules Janco by the Municipality of Bucharest, the National Bank of Romania, and the Jewish Colonial Trust (from the latter, the coupons are also referred to as "share warrants"). In addition to the coupons themselves, some documentation pertaining to them, including correspondence, can also be found in the file. Also contains a list of bank names with loan information from banks around the world.

Contains exterior & interior shots of buildings (including many houses and apartments, and a building called Hassmer), mostly identified as being designed by Jules and Marcel. Many or all are located in Bucharest.

The fonds contains materials pertaining to the life of Jules Janco, with an emphasis on his architectural career. This includes transcripts, diplomas, and letters of recommendation issued from the architecture school he attended along with his brothers in Switzerland, letterheads and business cards from Janco's professional collaboration with his brother Marcel Janco, professional notes and memos, a number of architectural sketches of homes and buildings in Romania and Palestine, and photographs and brochures pertaining to architectural projects Jules Janco was involved in--most prominently, Ștrandul Kiseleff (the Strand) and the Bucegi Sanatorium. A number of work-related objects, including scissors, a miniature magnifying glass, and spectacles, are also found in the fonds.

Personal records from Janco's childhood and young adulthood in Romania, through to his marriage to Mizzi Packer and emigration to Canada, can also be found in the fonds. This includes birth, marriage, and death certificates, citizenship records and passports, some personal and financial correspondence, and a number of coupon bonds issued to Janco and his father, Hermann Zvi Iancu. A large number of photographs document family trips around Romania and to France; some photographs from Janco's school days, including scenes with peers, are in the fonds.

Some research that Janco's own family members conducted about his life is also contained within the fonds. This includes a map of Bucharest demarcating sites of Janco's projects, a series of VHS tapes in which the audio from an interview with Janco is overlaid onto documentary footage.

Contains newspaper articles from Ilustratiunea Română (probably from late 1930s) which discusses Austria and Hitler, as well as The Sunday Times (1939) which discusses Jews and Palestine.

Contains postcards and landscapes from around Romania. Postcards are addressed to Mizzi Packer in Montreal, Jules Janco in Bucharest, as well as a Josica Janco (Marcel Janco's daughter) in Bucharest.