What does BSG stand for?

MLA style: "BSG." Acronym Finder . 2012. AcronymFinder.com 27 May. 2012 http://www.acronymfinder.com/Below-Surface-Grade-(BSG).html
Chicago style: Acronym Finder . S.v. "BSG." Retrieved May 27 2012 from http://www.acronymfinder.com/Below-Surface-Grade-(BSG).html
APA style: BSG. (n.d.) Acronym Finder. (2012). Retrieved May 27 2012 from http://www.acronymfinder.com/Below-Surface-Grade-(BSG).html

Below Surface Grade

This definition appears very rarely and is found in the following Acronym Finder categories:

Science, medicine, engineering, etc.

Other Resources:

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Samples in periodicals archive:

The thicker roots which are located close to the tree trunk do not absorb water and nutrients, those roots are the fine roots and they are usually located within a four to ten inch depth below surface grade.

What You Need to Know when Planting A Tree

Everything You Need to Know when Planting A Tree