1. In addition, a single source may contain both primary and secondary material . 2. As a tertiary source, Wikipedia can only summarize the published secondary material . 3. Extensive collections of both primary sources and secondary materials such as treatises are available. 4. More importantly, many high-quality sources contain both primary and secondary material . 5. As usual in Shirley's drama, this main plot is supported by secondary material . 6. Fair amount of secondary material here. 7. As a result, some critiques and reviews are a mix of primary and secondary material . 8. This may be achieved by designing processes more efficiently, increasing recycling and establishing markets for secondary materials . 9. And yet, this is seen as an acceptable citation for serious reference books, secondary materials and Wikipedia. 10. Another term sometimes seen in relation to this secondary material ( and other material produced similarly ) is activation products.
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