An electronic Yellow Pages viewer shows the pages of a Yellow Pages directory as they appear in the bound version. In particular, the method comprises computing the potential free capacity of each provider by subtracting the call batch size from the actual capacity, and dividing the potential free capacity by the overall capacity to determine the proportion potential free capacity; and allocating the call batch to the provider having the largest proportion potential free capacity. The formulations include at least two metals, at least two chelating agents, at least one surfactant, and at least one viscosity enhancing compound.