Timoshenko often included historical footnotes about the engineers and mathematicians who derived the theories (Euler, Cauchy, Saint-Venant). Reading these books provides an education in the history of science alongside the technical content.

Instead, you get three timeless strengths:

If you are studying a digital copy of his work, you are likely encountering theories that changed the field: Stephen P. Timoshenko | Vol 8, No 4 - ASCE Library