It sounds like you're looking for a PDF of Ilya Mikhelson's Structural Engineering Formulas.
Structural Engineering Formulas, Second Edition - Amazon.com structural engineering formulas ilya mikhelson pdf
This article explores the depth, utility, and legacy of Mikhelson’s work, and why a structured, accessible formula guide remains the silent workhorse of the engineering profession. It sounds like you're looking for a PDF
Step 1: Open the PDF to "Simply Supported Beams – Uniformly Distributed Load" and legacy of Mikhelson’s work