The Crossman papers are comprised of 95 letters and 4 tax documents.
The Correspondence series contains approximately 60 letters from Ferdinand while he was in the army, from 1862-1864. In his letters, Ferdinand inquired about Adelaide's day-to-day activities, and described his own in the army. Many letters mentioned their children, though not by name. He wrote about army life, fighting, military duties, pay, food, clothes, health, and personal news. In a letter dated May 15, 1863, Ferdinand refuted inaccurate news from Adelaide that the Union Army had taken Richmond. In one of his final letters, that of April 18, 1864, Crossman wrote that he sensed a major battle brewing and predicted that he might not make it home again, and that Adelaide should do her best to get on with her life, if he should die. Crossman would die of disease on August 9, 1864, at the Andersonville, Georgia, prison.
The rest of the letters are to Adelaide from her sister and friends. These concern daily life in Massachusetts, as well as family and personal news such as marriage, children, health, and death.
The Receipts and Tax Document series contains a 1859 tax record and three receipts for subscriptions to the True Flag weekly newspaper.