Field guides and reference layout
Nobody reads a field guide. They open it somewhere near the middle, holding the memory of a bird that has already flown, and they need to know within seconds whether this page is the right part of the book. Everything in a reference layout follows from that moment.
A mushroom key, a plant list, a pocket dictionary, a rules compendium, a parts catalog: the reader never arrives at page one. They land, orient, and either find the entry or turn again.
Every page has to say where it is
A novel can get away with a running head that repeats the author's name, because its reader arrived by turning pages in order. In a reference book the running head is the navigation, and it should carry the most specific thing that is true of the page below it: the entry range, the section, or both.
Section on the verso and range on the recto reads well — Waders on the left, Godwit–Greenshank on the right. Page numbers belong in the outside corners, where a thumb finds them while riffling, not centered at the foot. Running heads and page numbers has the mechanics.
Decide the entry template once
Before you set a single page, fix the fields: name, alternative names, description, range, notes — whatever your subject needs. Then give every entry the same fields, in the same order, with the same typographic treatment, and no exceptions.
A reader learns that pattern in about three entries and then stops reading and starts reading by position: range is always the fourth line, so the eye goes straight to the fourth line. Break the order once and the reader is reading again, slowly, without knowing why the book got harder.
Two decisions people postpone and should not:
- When a field is empty. Decide once whether the line disappears or prints as a stated absence, then apply that to all three hundred entries.
- When a field runs long. One species has a four-line description where the rest have one. A template that only looks right at a fixed depth is not a template.
Write the decisions down and set from them. The style sheet: how a series stays consistent is the same tool on a different problem.
Make the name findable without shouting
The entry name is what a scanning eye hunts for. It has to stand out from four lines of description, several hundred times, without turning the book into a poster.
A size step plus a weight change does it: the name a point or two above body size, bold or in small caps, everything else unchanged. Two changes are enough; three is loud. Reach for color last — most print-on-demand interiors are black ink only, and Color inside the book, and what it costs covers what changing that means.
Set the entry with a hanging indent, so the name starts at the left margin and the lines under it are indented past it. The names then form a column down the margin a thumb can run along. Alternative names go on the same line, in italic, so one pass picks up both.
The picture has to be beside the words
A field guide lives or dies on whether the illustration sits next to the sentence describing it. A reader comparing a real wing bar against a picture cannot hold a page turn in their head.
That outranks the usual rules about image flow. Build each entry as a block, image and text together, and accept a short page rather than split the pair: better two inches of white at the foot than the thrush printed on the page after the thrush.
Check each image against its printed size rather than its pixel count — pixels divided by printed inches, aiming for 300 DPI, with anything under 200 DPI at that size treated as a warning. Putting images inside a book has the arithmetic.
In the Interior Formatter. Inline images, full-page plates and two-page spreads are supported, each image checked against the size it will actually print at, and the contents is built from your real chapter structure rather than typed by hand. Start your interior → · about the Interior Formatter
Small enough to carry, flat enough to use
A book taken outdoors wants to be small. A book consulted with one hand wants to lie open. Those pull against each other.
A smaller trim narrows the measure, and the measure is what the entry template lives inside. An inside margin of 0.5 inches total serves a book up to 300 pages and satisfies both Amazon KDP and IngramSpark; on a 5 × 8 page that is a tenth of the width gone before you set an outside margin. Compose a spread of real entries at your candidate trim before committing — Choosing a trim size covers the rest.
Lying flat is a binding decision, and the bindings that do it cost you a printed spine: a coil-bound book cannot be shelved or scanned. Books that need to lie flat lays out the trade.
Tabs, edge marks and an index
Three devices separate a usable reference from a list.
- Thumb tabs. Die-cut tabs are a finishing operation most print-on-demand printers do not offer, so ask before designing for them. The printable substitute is a solid block bleeding off the fore edge, stepping down the page section by section. Standard bleed is 0.125 inches on the outside edges, so the block must run that far past the trim.
- Section marks on the edges. The same blocks, read on the closed book as bands down the fore edge, so a reader opens to a section without opening the book first.
- An index. The contents lists sections; the index finds the one name the reader came for, including the local name they know it by. On a reference book it is not optional — see Does your nonfiction book need an index?
Typeset your book
The Interior Formatter is free to use: name your book, bring your manuscript, and it sets real pages you can read before you commit to anything. You only pay when you want the files without the preview watermark.
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