Materials were unprocessed until 2021 and were considered the "B" series of the collection. Some items that were in these boxes have been matched and placed with the appropriate items in other series, mostly the Postcard-size negatoves. Some items were tentatively identified by previous Spencer Research Library staff, but these identifications could not be confirmed in 2021.

No other attempt has been made to match these remaining items and determine if they belong in the existing sequences or are duplicative of items elsewhere in the collection. Several of these items have corresponding prints, which can be found in the Prints subseries.