Gai {ital et} {ital al}. have proposed that cluster-molecular structure, in which a three- or four-particle cluster is well separated from the core, can be identified by the strong {ital E}1 transitions connecting cluster states with this structure. We use this signature to determine which cluster states in the {ital A}=14--19 region are cluster-molecular states. In addition, we note that such structure can also be recognized by comparing the results of three- and four-particle transfer reactions which populate the nucleus. In a nucleus possessing cluster-molecular structure, the three- and four-particle cluster strength lies in different states. We use this information to support the identification of molecular or nonmolecular structure in several nuclei. The examination of the transfer data also allows us to identify a nucleus, {sup 14}N, in which molecular and nonmolecular cluster states may coexist.