Sierra vs. Sierras: Not Just Another Tomato, Tomahto

I say tomato you say tomahto. Potato, Potahto. But what about Sierra, Sierras?
Planning for Prosperity

Winner of the American Planning Association’s prestigious Daniel Burnham Award, Planning for Prosperity is designed to help planners and decision-makers in the Sierra Nevada plan wisely and effectively for their communities’ futures. The reference guide outlines principles which, together, provide a new, more effective framework for land planning in the Sierra, and also ensure the quality of the planning process itself.
Investing for Prosperity

This is a new guide to economic and community development that offers hundreds of ways to achieve prosperity in fast-growing rural regions.