R. Ludvigsen 1979. A Trilobite zonation of Middle Ordovician rocks, Southwestern District of Mackenzie. Geol. Surv. Canada, Bulletin 312. 99 pp., 21 plates. Ottawa. Price 5.40 (elsewhere). ISBN 0 660 10165 3.

C. P. H.

doi:10.1017/S0016756800024870

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R. Ludvigsen 1979. A Trilobite zonation of Middle Ordovician rocks, Southwestern District of Mackenzie. Geol. Surv. Canada, Bulletin 312. 99 pp., 21 plates. Ottawa. Price $4.50 (Canada); $5.40 (elsewhere). ISBN 0 660 10165 3.

Volume 118, Issue 1
C. P. H.
DOI: https://doi.org/10.1017/S0016756800024870

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R. Ludvigsen 1979. A Trilobite zonation of Middle Ordovician rocks, Southwestern District of Mackenzie. Geol. Surv. Canada, Bulletin 312. 99 pp., 21 plates. Ottawa. Price $4.50 (Canada); $5.40 (elsewhere). ISBN 0 660 10165 3.

Volume 118, Issue 1
C. P. H.
DOI: https://doi.org/10.1017/S0016756800024870

To save this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you used this feature, you will be asked to authorise Cambridge Core to connect with your Google Drive account. Find out more about saving content to Google Drive.

R. Ludvigsen 1979. A Trilobite zonation of Middle Ordovician rocks, Southwestern District of Mackenzie. Geol. Surv. Canada, Bulletin 312. 99 pp., 21 plates. Ottawa. Price $4.50 (Canada); $5.40 (elsewhere). ISBN 0 660 10165 3.

Volume 118, Issue 1
C. P. H.
DOI: https://doi.org/10.1017/S0016756800024870

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R. Ludvigsen 1979. A Trilobite zonation of Middle Ordovician rocks, Southwestern District of Mackenzie. Geol. Surv. Canada, Bulletin 312. 99 pp., 21 plates. Ottawa. Price $4.50 (Canada); $5.40 (elsewhere). ISBN 0 660 10165 3.

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R. Ludvigsen 1979. A Trilobite zonation of Middle Ordovician rocks, Southwestern District of Mackenzie. Geol. Surv. Canada, Bulletin 312. 99 pp., 21 plates. Ottawa. Price $4.50 (Canada); $5.40 (elsewhere). ISBN 0 660 10165 3.

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