  We present spectroscopic follow-up observations of 70{\mu}m selected galaxies
from the SWIRE XMMLSS and Lockman Hole fields. We have measured spectroscopic
redshifts for 293 new sources down to a 70{\mu}m flux limit of 9mJy and R < 22.
The redshift distribution peaks at z ~ 0.3 and has a high redshift tail out to
z = 3.5. We perform emission line diagnostics for 91 sources where [OIII],
H{\beta}, [NII], H{\alpha} and [SII] emission lines are available to determine
their power source. We find in our sample 13 QSOs, 1 Seyfert II galaxy, 33 star
forming galaxies, 30 composite galaxies, 5 LINERs and 21 ambiguous galaxies. We
fit single temperature dust spectral energy distributions (SEDs) to 81 70{\mu}m
sources with 160{\mu}m photometry to estimate dust temperatures and masses.
Assuming the dust emissivity factor ({\beta}) as 1.5, we determine temperatures
in the range ~ 20-60K and dust masses with a range of 10{^6}-10{^9} M{_\odot}.
Plotting these objects in the luminosity-temperature diagram suggests that
these objects have lower dust temperatures than local IR luminous galaxies. The
Herschel Space Observatory will be crucial in understanding the nature of these
sources and to accurately determining the shape of the Rayleigh-Jeans tail of
the dust SED. We then model SEDs from optical to far-IR for each source using a
set of galaxy and quasar templates in the optical and near-IR (NIR) and with a
set of dust emission templates (cirrus, M82 starburst, Arp 220 starburst and
AGN dust torus) in the mid-IR (MIR) to far-IR (FIR). The number of objects fit
with each dust template are: 57 Arp 220, 127 M82, 9 cirrus, 1 AGN dust torus,
70 M82 and cirrus, 26 M82 and AGN dust torus and 3 Arp 220 and AGN dust torus.
We determine the total IR luminosity (LIR) in range 10{^8}-10{^{15}} L{_\odot}
by integrating the SED models from 8 to 1000{\mu}m.
