为提高ProQuest系统稳定性，保障系统的数据安全，ProQuest计划于北京时间2021年1月31日11:00至1月31日19:00对ProQuest系统进行升级维护。

维护期间，ProQuest下列系统将暂停服务，所涉及的数据库/平台会出现无法正常使用的情况，请您提前做好相应安排，由此给您带来的不便敬请谅解。 

Research databases 

• ProQuest Platform (http://www.proquest.com)
• ProQuest Dialog (http://www.proquest.com/professional, dialog.proquest.com/professional)
• ProQuest Dialog API (api-dialog.proquest.com)
• ProQuest Congressional (search.proquest.com/congressional, congressional.proquest.com)
• Homework Central (explore.proquest.com)
• ProQuest ETD Administrator
• ProQuest Archiver
• CultureGrams
• Chadwyck-Healey databases
• ProQuest Research Companion
• Fold3 Library Edition
• Newspapers.com
• Digital Sanborn Maps
• TDM Studio
• Dissertations Dashboard

• Ebook Central
• LibCentral
• PubCentral

• LAZR
• NUVO
• DORP
• PHILO
• PHAROS

• Books in Print®
• Resources for College Libraries
• ProQuest Syndetic Solutions
• Self-Published Author

• My Identifiers
• SAN (Standard Address Number)