Mortar grade data source information
Primary source:
Wolfram|Alpha Knowledgebase, 2024.
Background sources and references:
- Glover, T. J. Pocket Ref. (3rd ed.) Sequoia Publishing, 2007.
- Kipfer, B. A. The Order of Things: Hierarchies, Structures, and Pecking Orders. Workman Publishing Company, 2008.
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The Wikimedia Foundation, Inc. Wikipedia. »
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