Part I. Preparation by Authors.

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Introduction 7 Purpose and value of illustrations 8 Selection and approval of illustrations 8 Submittal of illustrations 10 Kinds of illustrations 10 Sizes of illustrations 11 Subdivisions of plates and figures 12 Preparation of copy by authors 12 Character of original material 12 Preliminary preparation of maps 13 Material available for base maps 14 Basic features of maps 17 Standard scales 18 Orientation of maps 18 Projection 18 Explanation 19 Titles of maps and other illustrations 19 Symbols used on maps 20 General features 20 Letter symbols 20 Oil and gas symbols 21 Symbols for use on maps showing features of ground water 21 Black-line conventions 23 Materials used in preparing maps 23 Paper 23 Bristol board 24 Tracing linen 24 Inks 25 Drawing pens 25 Pencils 25 Rubber erasers and cleaners 25 Colored pencils and crayons 26 Water colors 26 Japanese transparent water colors 26 Coloring geologic maps 27 Diagrams 28 Essential features 28 Plans of mine workings 29 Sections 29 Lithologic symbols 32 Use of photographs as illustrations 32 Essential features 32 Copyrighted photographs 33

Sources of photographs 34 Lending original photographs and drawings 34 Unpublished photographs 34 Specimens 34 General requirements 34 Borrowed and fragile specimens 35 Transmittal of paleontologic specimens 35 Making up plates 36 Reuse of illustrations 37 Approval of finished illustrations 38 Revision of illustrations 38 Submittal of proofs 38 Proof-reading illustrations 39 General considerations 39