Page:NBS Circular 553.djvu/30

There was a problem when proofreading this page.

1YR-2YR

An image should appear at this position in the text.

2YR-3YR

An image should appear at this position in the text.

19

Retrieved from "https://en.wikisource.org/w/index.php?title=Page:NBS_Circular_553.djvu/30&oldid=13942760"