Documents Relating to the Construction of Bridges. Engineers' drawing for the bridge on Blacktown Rd near Richmond, 1870. Enclosed in Mylar; Engineers' drawing for the Chain of Ponds Creek bridge, 1868. Enclosed in Mylar; Specification for the bridge at the Chain of Ponds Creek. Enclosed in Mylar; & two receipts relating to the above drawings. All signed by Donald MacPherson. Enclosed in Mylar. Estimate $80-150