private IEnumerable<Member> GetMembersForLetter(string search, string letter)
        {
            var result = new List<Member>();
            int currentChunk = 0;
            int maxChunk = 0;
            var req = new RestRequest();
            req.AddParameter("findmember", search);

            while (currentChunk <= maxChunk)
            {
                req.AddOrSetParameter("letter", letter);
                req.AddOrSetParameter("chunk", currentChunk);
                var resp = this.GetClient().ExecuteGetAdminRequest(_paths.Single(), req);
                var doc = GetHtmlDocument(resp.Content);
                
                result.AddRange(ExtractMembersFromPage(doc));

                // More chunks?
                var nextChunk = GetHrefValuesForParam(doc, "chunk").SingleOrDefault();
                if (nextChunk != null)
                    maxChunk = Math.Max(maxChunk, Convert.ToInt32(nextChunk));
                currentChunk++;
            }

            return result;
        }