F.R. Walker: Estimating Resources and Construction Store
Business, Construction and Maintenance, Estimating - F.R. Walker Company. Construction cost estimating reference books, forms, and tools.
https://www.frankrwalker.com/
Estimating
Design Cost Data Magazine
Business, Construction and Maintenance, Estimating - Design Cost Data Magazine. Publisher of estimating systems and historical construction cost data.
https://dcd.com/
RSMeans Construction Bookstore
Business, Construction and Maintenance, Estimating - R.S. Means Company. Construction cost software and publications, reference books, consulting services, and estimating seminars.
https://www.rsmeans.com/