how to make bootable live wheezy USB that doesn't use isohybrid

[Jeffrey Mark Siskind <qobi@purdue.edu>]

I'd like to make a live wheezy USB dongle. I followed the instructions on

   https://www.debian.org/CD/faq/#write-usb

to make a live USB from

   http://cdimage.debian.org/mirror/cdimage/archive/7.11.0-live/amd64/iso-hybrid/debian-live-7.11.0-amd64-standard.iso

but apparently my machine, an older Dell Poweredge R815, won't boot from
isohybrid. Can someone point me to a howto for making a bootable live wheezy
USB dongle that doesn't use isohybrid?

    Thanks,
    Jeff (http://engineering.purdue.edu/~qobi)