Each topic has a keyword or thesaurus linked to a multiengine search tool. Select topics are further enhanced by occupational definitions and hub and authority sites collected, and tested over the past 5 years of life on the Web.

Finally at http://www.plantamerica.org/links/recomend.htm, Landscape Architecture hub and authority sites, comprising best of breed URLs have been collected, tested and added, over a period of years by tha author.