The Harris County Transit Services Division [3] provides a bus service that leaves from in front of the library, travels down FM 2100 to E Wallisville Rd, to San Jacinto Mall, then back to Crosby. Adults are $1.00 each way and children .50 cents. Seniors (65 & older with ID) and Disabled with ID are .50 cents each way. You must have exact change as the driver can not make change. The bus runs from about 5:45 am to 6 pm weekdays. For a schedule, the library has copies or you can check online at the above link. There are also other routes listed on their page.
Links:
[1] http://hcpl.net/users/carolyn
[2] http://wwww.hcpl.net/sites/default/files/transit.gif
[3] http://www.harriscountytransit.com/
[4] http://hcpl.net/category/tags/bus
[5] http://hcpl.net/category/tags/route
[6] http://hcpl.net/category/tags/transit
[7] http://hcpl.net/taxonomy/term/5
[8] http://hcpl.net/category/branches/community