Masani, N.J. 1951. Simple Calculations in the Design of Forest Bridges of Stock Spans of 15, 20, 30 and 40 Feet - Part V ( a ) (Graphical Method). Indian Forester. 77, 1 (Jan. 1951), 28–54. DOI:https://doi.org/10.36808/if/1951/v77i1/23276.