Diagnostic medical sonographers must complete 24 continuing education credits every two years to remain certified. To maintain ARDMS credentials, sonographers must earn at least 30 continuing medical education (CME) credits in a 3-year period and pay an annual renewal fee.nly a few states require sonographers to be licensed. While state requirements can vary, a professional certification from a national credentialing organization is often required to become licensed.
[ edit intro ]. The Allegheny Portage Railroad was the section of the Pennsylvania Main Line of Public Works that traversed the Allegheny Mountains in Pennsylvania. It consisted of alternating level and inclined plane stretches of rail, pulling canal boats on carriages.
The Central Pacific Railroad (CPRR) is the former name of the railroad network built between California and Utah, US, that built eastwards from the West Coast in the 1860s, to complete the western part of the . First Transcontinental Railroad  in North America. It is now part of the Union Pacific Railroad. Many 19th century national proposals to build a transcontinental railroad failed because of the energy consumed by political disputes over slavery. With the secession of the South, the modernizers in the Republican Party controlled the US Congress.