關於「PSW os」標籤，搜尋引擎有相關的訊息討論：

The Everything Easy Large-Print Word Search Book, Volume III: 150 ...books.google.com.sg › booksPesticides Documentation Bulletinbooks.google.com.sg › booksListe der IATA-Codes/P - Wikipediade.wikipedia.org › wiki › Liste_der_IATA-Codes