What do discipline rankings show?
This page lists scientific disciplines where Robert J Letcher ranks among the global top 100, by peer-reviewed article count, peer-reviewed citation count, or most cited peer-reviewed article within publications classified under that discipline.
What do A pos and C pos mean?
The # column is the rank of each listed entry for Robert J Letcher — rank 1 means this entry is where Robert J Letcher has the most articles or citations. A pos and C pos show the reciprocal: the position of Robert J Letcher within that entry's own ranked list, by articles and citations respectively. A low value means Robert J Letcher is among the most prominent contributors for that entry.