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30 https://www.quora.com/Where-can-I-find-the-Chemistry-and-Chemical-Reactivity-9th-Edition-Kotz-solutions-manual/answer/Werner-Dylan?prompt_topic_bio=1
31 https://www.quora.com/Where-can-I-find-the-solutions-manual-for-Antenna-Theory-Fourth-Edition-by-Balanis/answer/Tom-Semour?prompt_topic_bio=1