Download the <>, by Micheal Abrash

wget http://twimgs.com/ddj/abrashblackbook/gpbb{0..70}.pdf

or

curl -O http://twimgs.com/ddj/abrashblackbook/gpbb{0..70}.pdf

also, you can use the command below:

wget -r -l1 -H -t1 -nd -N -np -A.pdf -erobots=off http://drdobbs.com/high-performance-computing/184404919