Yields of ${\pi }^{\pm }$, $K^{\pm }$, $p^{\pm }$, and $e^{\pm }$ at 2 and 3 deg from 16- and 18-GeV electrons on three different targets have been measured at the Stanford 2-mile electron accelerator. The targets were: 0.3 radiation length (r.l.) of Be, 0.3 r.l. of Fe, and a combination consisting of 0.6 r.l. of Fe followed by 0.3 r.l. of Be. The yields are discussed in terms of the Drell mechanism (for ${\pi }^{\pm }$, $K^{\pm }$, $p^{\pm }$), $\rho$ production (${\pi }^{\pm }$), associated production from pions produced by photons ($K^{+}$), photodisintegration ($p^{+}$), and elastic scattering ($e^{-}$). The $A$ dependences of the yields have been determined from the ratio of the Be- and the Fe-target yields.

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