ISBN 978-621-452-408-2 (paperbound)
ADVISORY
Due to the ongoing maintenance of our data center, access to the International Standard Numbering System - Philippine Online Numbering Application System (ins-poas.nlp.gov.ph) will be limited from 8:00 am to 5:00 pm until further notice.
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Please schedule your transactions accordingly.
We apologize for any inconvenience this downtime may cause and appreciate your understanding. Thank you!