This collection contains two notebooks from Charles Sibbald, Rensselaer Class of 1912. The first notebook, titled, "Notes on Checking," includes directions on needle checks, grades of sewers and sanitation, dimensions of items such as laundry washers, and notes on contract drawings. The second notebook contains a note from Sibbald to Rensselaer, stating that this notebook is the byproduct of years of construction work with the New York State Public Works Department. The notebook includes information such as rainfall and run-off data, manhole cover frame dimensions, water consumption, and dimensions of flow drains.