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Genera and species that turn up in collections, with PBDB classification and range.

Rock units collectors and dealers name on a label: age, lithology, members, what is found in them.

Named sites — quarries, badlands, beaches — with land status and what the rules there are.

The geologic time scale, every eon to age, with the boundary ages Macrostrat and PBDB publish.

Species on the IMA list, with formula, system, hardness and type locality.

Molluscan families, extant and fossil, after WoRMS and MolluscaBase.

Preparation, conservation and documentation, in our own words with the science cited.

What may be collected, kept and sold — by country and, for the United States, by state.

Step-by-step: cataloguing, labelling, photographing, asking a forum for an identification.

The words on a label and in a paper, defined.

Archaeological cultures collectors name on a label — Clovis to Qing — with dates, regions, typical objects and the legal position of their material.

Archaeological periods by region, from the Palaeolithic to the post-medieval, with the PeriodO definition each one cites.

Point types, tools, vessels, brooches and coins: diagnostic traits, dates, cultures, and what reproductions look like.

Cherts, flints, obsidians, ground stone, ceramics and metals — where they outcrop, how to tell them, what is passed off as them.

Public, interpreted archaeological sites: what was found, who manages them, and the rule that nothing may be collected.