<https://www.nhbs.com/diatoms-of-europe-volume-8-the-diatom-genus-gomphonema-from-the-republic-of-macedonia-book>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.nhbs.com/diatoms-of-europe-volume-8-the-diatom-genus-gomphonema-from-the-republic-of-macedonia-book?bkfno=231539>