The fonds consists of correspondence with art dealers, artists and public art institutions, invoices, shipping and customs forms and other documents relating to their involvement in the international art market in the mid-20th century. Carbon copies of letters written by the Zacks and letters written to them are included. The fonds also contains the administrative files kept by the Zacks: insurance lists, index cards for art and books, photographs and catalogues. The fonds includes the records of the Zacks’ involvement as board members in a variety of organizations relating to the arts, including agendas, memos, minutes of meetings, and travel arrangements. Correspondence files document the Zacks’ involvement in the State of Israel, through its cultural institutions, and communication with prominent citizens. Mrs. Zacks’ papers created after her husband’s death relate to her honourary degree, the Order of Canada, board activities and social involvement. Fonds is comprised of the following series: General correspondence Artist files Dealer files Public institution files Exhibition catalogues Photographs Administrative files Exhibitions of the collection Boards and committees Israel Personal