The bulk of the collection consists of Benckendorff family correspondence with prominent Russian noble families, documents, and photographs. There are also manuscripts, financial statements and drawings.

The memoirs discuss Epanchin's military service under Tsars Alexander II, Alexander III, and Nicholas II, from the Russo-Turkish War of 1877-88 through the Civil War, and the emigration in Europe. Also included is a photocopy of the memoirs.