The encyclopedia of birds edited by C. M
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P. J. Haselock
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Article
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1986
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John Wiley and Sons
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English
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lines in triangles but in tetrahedra it becomes much more difficult: however this may be a function of the age of the reviewer. Appendices consist of short chapters on (A) Radiometric dating and (B) Calculation of the CIPW norm: this has been simplified by omitting some of the less common elements