Kathryn S. Olmsted, the author of "Red Spy Queen" (2002), points out: "Every two weeks, Elizabeth would travel to Washington to pick up documents from the Silvermasters, collect their Party dues, and deliver Communist literature. Soon the flow of documents grew so large that Ullmann, an amateur photographer, set up a darkroom in their basement. Elizabeth usually collected at least two or three rolls of microfilmed secret documents, and one time received as many as forty. She would stuff all the film and documents into a knitting bag or other innocent feminine accessory, then take it back to New York on the train." Moscow complained that around half of the photographed documents received in the summer of 1944 were unreadable and suggested that Ullmann receive more training. However, Pavel Fitin, who was responsible for analyzing the material, described it as very important data.