化学门户在资源覆盖面方面的另一个策略是要借鉴和利用已有的化学信息源知识，例如在索引化学电子期刊时，期刊的收集范围将综合参考:

	美国化学文摘CA的核心期刊目录(Core Journals Covered in Caplus)
	ISI的Current Contents Physical, Chemical & Earth Sciences中与化学有关的期刊目录(如Chemistry, Organic Chemistry/Polymer Sciences, Inorganic & Nuclear Chemistry, Physical Chemistry/Chemical Physics, Spectroscopy/Instrumentation/Analytical Sciences, Applied Physics/Condensed Matter/Materials Science)
	EI的化工期刊目录(Science Building: Chemistry, Engineering Departments: Chemical Engineering, Technical Journals: Chemistry & Chemical Engineering)等。