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ASTM International, formerly known as American Society for Testing and Materials, is an international standards organization that develops and publishes voluntary consensus technical standards for a wide range of materials, products, systems, and services. See Wikipedia and www.astm.org.
CR - Crushed Rock ?
California bearing ratio (CBR) test is a penetration test for evaluation of the mechanical behavior of road base and subbase course layers.
Graded aggregate base (GAB)
MD - A grading system for aggregates e.g. MD #1 = 3 1/2 - 4"; MD #5 = 1 - 1 1/2"; MD #8 = 3/8 - 1/2"
MD: Micro deval test Maryland
MDOT SHA - Maryland Department of Transportation State Highway Administration
Aggregate Sizing Explained
Project Planning and Estimating Resources | The Stone Store
Crushed Stone Examples | paxcos.com
Development Of Design Guidelines For Proper Selection Of Graded Aggregate Base In Maryland State Highways