Common Sense Home - This 1980s popular mechanics article is pretty popular in the root cellar, prepping and food storage groups. Found a free pretty good reference old Popular Mechanics for building
Above Ground Root Cellars: Designs, Plans, Storage Chart, and More Essential Info to Get Started
Root Cellars
Inexpensive Root Cellars: 13 Literally Cool Ideas to Chill With - The Provident Prepper
Eat better for less: How to build your own root cellar | Healthing.ca
How to Build an Underground Root Cellar: Step-by-Step Guide
How to Build an Underground Root Cellar: Step-by-Step Guide
ROOT CELLAR Ventilation System | 4 INCH PVC Schedule 40 - YouTube
Root Cellar Ventilation Solutions - Part 2 of Building A Semi-Traditional Root Cellar - YouTube
Basement root cellar build w/ pics (root-cellars forum at permies)
1840 Root Cellar - Installing Ventilation for Temperature and Radon (part 1) - YouTube