def _get_identifiers(item):
    """Pull identifiers from an item into a dict."""
    identifiers = {"eissn": "", "issn": "", "doi": "", "prop_id": "", "isbn": ""}
    for identifier in item["Item_ID"]:
        if identifier["Type"] == "Print_ISSN":
            identifiers["issn"] = identifier["Value"]
        elif identifier["Type"] == "Online_ISSN":
            identifiers["eissn"] = identifier["Value"]
        elif identifier["Type"] == "ISBN":
            identifiers["isbn"] = identifier["Value"]
        elif identifier["Type"] == "DOI":
            identifiers["doi"] = identifier["Value"]
        elif identifier["Type"] == "Proprietary_ID":
            identifiers["prop_id"] = identifier["Value"]

    return identifiers