Completed Assignment

Note:  I could not get R to retrieve data directly from the source zip
without corruption.  I had to unzip the file locally and retrieve data
from the ~180 MB txt file within the zip.  The source links are in the
MD file README-JHR.    For reference, the df I created from the source
data is saved as workingdata.csv for reference. Thanks in advance for
your assessment.  Please comment freely, ask Qs, etc.
Thanks,
John