Principal section

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(Crystallog.) a plane passing through the optical axis of a crystal.

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Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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The site's principal section is the interactive Eviction Map for investigating evictions and their socioeconomic correlates.
Each of the 101 verbs in the principal section of I verbi is integrated into a graphic depicting the verb.
The main factors influencing SFRC tensile strength are these: volume and distribution of steel fibres in principal section, anchorage of fibre in concrete matrix, yield strength of fibre and strength of concrete [17, 18].
Jean Milly's excellent article on La Recherche is followed by additional useful entries on the novel: "Histoire des editions" and "Prepublications." Each principal section of the novel (Du cote de chez Swann, A l'ombre des jeunes filles en fleurs, etc.,) is given a separate article with extensive bibliographical references for further reading plus a list of cross-references for characters, themes, and biographical items.
The dictionary section is the book's principal section. It is a very ambitious effort to list and define federal financial compliance terms.
Preceding each principal section is a brief introduction by the editor of the issues raised.
The principal section of MEDLINEplus is Health Topics, which is a collection of thousands of publications from the leading federal government medical agencies, including the National Institutes (Aging, Cancer, Mental Health, etc.), the Food and Drug Administration, the Center for Disease Control, and others.
The principal section of this paper is the aptly-titled 'Witchcraft Themes in the Text of Celestina', in which Severin offers over five hundred and seventy lines of prose, including commentary of her own, references, quotations, and summary of the text, to accompany some seven hundred and thirty lines, in smaller type, of indented quotations from the dialogue text of Celestina.
In the first principal section, "Grundzuge der Musikanschanung von Weber und Berlioz," Heidlberger suggests a number of parallelisms in the critical writings of the two figures.
The principal section of NCS contains detailed specs in 85 categories for each model.
The principal section of the work, "Juke Box Music," contains the discographical entries, subdivided into "Commercial Releases," "Noncommercial Issues," and "Others." Continuing the song-title theme, the first chapter "Plastic Man," describes the format of the entries, presents a discussion of mono and stereo releases, and includes reproductions of a variety of label styles.
With an eye toward visual and material culture, this edited volume consists of three principal sections. First, twenty-two "Object Lessons" give brief analyses of the island through print, portraiture, and physical artifacts.

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