what is manuals???
Manuals are useful in providing information for identification of names of species found in an area. Monographs contain information on any one taxon. Catalogues are compilations of plant information including names and classifications. Flora, manuals,monographs and catalogues are means of recording descriptions.
वैद्युत द्विध्रुव के कारण विद्युत विभव ज्ञात कीजिए
