CONTENTdm collection of collections: http://collections.contentdm.oclc.org/ Many libraries use this software to manage their digital collections including Iowa!
Search for more LibGuides at: http://libguides.com/ You may find guides created by my Korean Studies Librarian colleagues at other libraries or find more links to digital resources.
In order to search Korean language materials and/or Korean authors' works in library catalogs in North America, you need to know how to romanize Hangul words.