PRESS PHOTOS BY AL RECKERLehigh Heidelberg Cement Co. employees and managers pay a visit to Atlas Cement Company Memorial Museum, Northampton, during a weeklong conference for the company's north region. Mike Gonzales, manager of the Evansville, Berks County, headquarters, organized the museum tour for personnel from plants in Mitchell, Ind., Glens Falls, N.Y., Mason City, Iowa, and Union Bridge,