sources</code>: A data frame.The result of calling <code><a href='wbsources.html'>wbsources</a></code></p></li>
<li><p><code>datacatalog</code>: A data frame.The result of calling <code><a href='wbdatacatalog.html'>wbdatacatalog</a></code></p></li>
<li><p><code>topics</code>: A data frame.The result of calling <code><a href='wbtopics.html'>wbtopics</a></code></p></li>
<li><p><code>income</code>: A data frame.The result of calling <code><a href='wbincome.html'>wbincome</a></code></p></li>
<li><p><code>lendin