At an unknown point in the past roughly 600 drawings were separated from the entire Basement Recovery Collection. About 2/3 of these drawings were numbered sequentially and titled in black ink based on three series. Series A contains items relating to the Art Gallery, series B contains topographic plans, and series C covers Other Buildings (later renamed Architectural Plans). This original order has been adhered to in arrangement. In 1989, these files were transferred into ten flat file drawers. Any additional items not described in the original entry were separated into the three series and given numbers based on the original sequential order. Roughly 40 items from series C were cleaned. See green binder.

In 1997, there was an “inventory continuation” in which more Centennial drawings were discovered from within the larger Basement Recovery Collection. New items were partially catalogued in the green binder, but most items were not. Each item was given a “temporary number” based on the larger Basement Recovery Collection, but not based on the original 3 series sequential order. Items were inventoried in the red binder and were not arranged numerically. Most items were not placed in the flat files, and were left randomly distributed among the rolled files. In 2010, items from the basement recovery collection which were not previously processed were arranged and described utilizing an independent system. This continued the larger temporary numbering system mentioned previously, and gave each new item another unique identifier. Items which were arranged separately here are directly related to many items in the Centennial Exhibition Collection.

In 2012, materials from the flat file were described, cleaned and were individually input into nearly optimum- level records for each individual item into Archivists Toolkit. In an attempt to gain intellectual control over related items, this project expanded to include all additional records noted in the red inventory binder from 1997 which included a large number of rolled and shelved items. Since a large amount of “A” and “C” series items were given temporary numbers, and to maintain their relation to the larger Basement Recovery Collection, these numbers were kept and noted with a “T” in the component unique identifier (ex. T-251) and integrated sequentially into the finding aid. A limited number of items overlapped with the original 1989 system; however the T designation served to appropriately distinguish them. Additionally, items were integrated from the Basement Recovery Collection which should have been initially placed in this collection. These items have retained the Basement Recovery numbering system, and have been given a "B" designation.

What exists now is essentially an integration of 4 systems- the original “inked” numbers, the 1989 series separation and numbering, the 1997 temporary number system, and the 2010 Basement Recovery system. For the first time all of the records are intellectually in one place.

Multiple items were discovered which did not seem to be included in the inventory. They were given sequential numbers based on the 1989 series.

Integrated records from the shelved series were divided into “folder” denominations, as well, for the sake of expedited searching and uniformity if not in actual physical form. Rolled items were arranged into numerical groups close numbers, such as 250-300. Within these grouped sets are all items designated with the numbers in this sequence, which greatly varies. For example, grouping 250-300 contains two unique items. Grouping numbers and sizes are arbitrary.