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Authors

A. G. Leonard

Document Type

Research

Abstract

In the Upper Mississippi Valley for a considerable period after the mines began to be operated much more lead than zinc was produced. It was not until 1860 that the latter metal came into market. Since then the zinc production has rapidly increased. During the ten years previous to 1882 the output of zinc more than doubled that of lead, while in 1889, according to the last federal census report the proportion between the two was as 18 to 1 for the entire region.

Publication Date

1893

Journal Title

Proceedings of the Iowa Academy of Sciences

Volume

1

Issue

Pt. 4

First Page

48

Last Page

52

Copyright

©1893 Iowa Academy of Science, Inc.

Language

en

File Format

application/pdf

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