C138-Standard Test Method for Unit Weight. ASTM, C Yield, and Air Content (Gravimetric) of Concrete, 2001.
bibtex   
@article{astm_c138-standard_2001,
	title = {C138-{Standard} {Test} {Method} for {Unit} {Weight}},
	journal = {Yield, and Air Content (Gravimetric) of Concrete},
	author = {ASTM, C},
	year = {2001},
}

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