  High-resolution and high S/N CCD spectra were analyzed to determine accurate
LTE abundances in four lambda Boo stars: pi^1 Ori, 29 Cyg, HR 8203 and 15 And.
In general, 14 chemical elements were investigated. The main results are the
following: all stars have a strong deficiency of the majority of investigated
metals. Oxygen exhibits a moderate deficiency. The carbon abundance is close to
the solar one.
  The results obtained support an accretion/diffusion model, which is currently
adopted for the explanation of the lambda Boo phenomenon.
