The total hadronic cross-section sigma gamma gamma(W) for the interaction o
f real photons, gamma gamma --> hadrons, is measured for gamma gamma centre
-of-mass energies 10 less than or equal to W less than or equal to 110 GeV.
The cross-section is extracted from a measurement of the process e(+)e(-)
--> e(+)e(-) gamma*gamma* --> e(+)e(-) + hadrons, using a luminosity functi
on for the photon flux together with form factors for extrapolating to real
photons (Q(2) = 0 GeV2). The data, were taken with the OPAL detector at LE
P at e(+)e(-) centre-of-mass energies root s(ee) = 161, 172 and 183 GeV. Th
e cross-section sigma gamma gamma (W) is compared with Regge factorisation
and with the energy dependence observed in yp and pp interactions. The data
are also compared to models which predict a faster rise of sigma gamma gam
ma(W) compared to gamma p and pp interactions due to additional hard gamma
gamma interactions not present in hadronic collisions.