The development of a central repository for all land survey documents began in the early 1970s. The Repository Section now contains approximately two million documents in digital format. Land Survey documents play an extremely important part in the determination of land boundaries. Private land surveyors, title insurers, recorders, attorneys, real estate professionals, and landowners must rely on these documents.

The Repository is responsible for acquiring and archiving survey documents through contact with all county recorders and county surveyors in Missouri. Most of these documents are received digitally or by mail from the counties. The documents are microfilmed, scanned, jacketed and indexed so they can be accessed through the Land Survey Index System. A duplicate roll of filmed images is stored in the Secretary of State's vault.

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